Trigonometría Ejemplos

$\frac{\tan (a) - \tan (b)}{\cot (b) - \cot (a)} = \frac{\tan (b)}{\cot (a)}$

Step 1

Comienza por el lado izquierdo.

$\frac{\tan (a) - \tan (b)}{\cot (b) - \cot (a)}$

Step 2

Convierte a senos y cosenos.

Toca para ver más pasos...

Escribe $\tan (a)$ en senos y cosenos mediante la identidad del cociente.

$\frac{\frac{\sin (a)}{\cos (a)} - \tan (b)}{\cot (b) - \cot (a)}$

Escribe $\tan (b)$ en senos y cosenos mediante la identidad del cociente.

$\frac{\frac{\sin (a)}{\cos (a)} - \frac{\sin (b)}{\cos (b)}}{\cot (b) - \cot (a)}$

Escribe $\cot (b)$ en senos y cosenos mediante la identidad del cociente.

$\frac{\frac{\sin (a)}{\cos (a)} - \frac{\sin (b)}{\cos (b)}}{\frac{\cos (b)}{\sin (b)} - \cot (a)}$

Escribe $\cot (a)$ en senos y cosenos mediante la identidad del cociente.

$\frac{\frac{\sin (a)}{\cos (a)} - \frac{\sin (b)}{\cos (b)}}{\frac{\cos (b)}{\sin (b)} - \frac{\cos (a)}{\sin (a)}}$

Step 3

Simplifica.

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Multiplica el numerador y el denominador de la fracción compleja por $\cos (a) \cos (b) \sin (b) \sin (a)$ .

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Multiplica $\frac{\frac{\sin (a)}{\cos (a)} - \frac{\sin (b)}{\cos (b)}}{\frac{\cos (b)}{\sin (b)} - \frac{\cos (a)}{\sin (a)}}$ por $\frac{\cos (a) \cos (b) \sin (b) \sin (a)}{\cos (a) \cos (b) \sin (b) \sin (a)}$ .

$\frac{\cos (a) \cos (b) \sin (b) \sin (a)}{\cos (a) \cos (b) \sin (b) \sin (a)} \cdot \frac{\frac{\sin (a)}{\cos (a)} - \frac{\sin (b)}{\cos (b)}}{\frac{\cos (b)}{\sin (b)} - \frac{\cos (a)}{\sin (a)}}$

Combinar.

$\frac{\cos (a) \cos (b) \sin (b) \sin (a) (\frac{\sin (a)}{\cos (a)} - \frac{\sin (b)}{\cos (b)})}{\cos (a) \cos (b) \sin (b) \sin (a) (\frac{\cos (b)}{\sin (b)} - \frac{\cos (a)}{\sin (a)})}$

Aplica la propiedad distributiva.

$\frac{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\sin (a)}{\cos (a)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\sin (b)}{\cos (b)})}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Simplifica mediante la cancelación.

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Cancela el factor común de $\cos (a)$ .

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Factoriza $\cos (a)$ de $\cos (a) \cos (b) \sin (b) \sin (a)$ .

$\frac{\cos (a) (\cos (b) \sin (b) \sin (a)) \frac{\sin (a)}{\cos (a)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\sin (b)}{\cos (b)})}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Cancela el factor común.

Reescribe la expresión.

$\frac{\cos (b) \sin (b) \sin (a) \sin (a) + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\sin (b)}{\cos (b)})}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Eleva $\sin (a)$ a la potencia de $1$ .

$\frac{\cos (b) \sin (b) ({\sin (a)}^{1} \sin (a)) + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\sin (b)}{\cos (b)})}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Eleva $\sin (a)$ a la potencia de $1$ .

$\frac{\cos (b) \sin (b) ({\sin (a)}^{1} {\sin (a)}^{1}) + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\sin (b)}{\cos (b)})}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Usa la regla de la potencia $a^{m} a^{n} = a^{m + n}$ para combinar exponentes.

$\frac{\cos (b) \sin (b) {\sin (a)}^{1 + 1} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\sin (b)}{\cos (b)})}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Suma $1$ y $1$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\sin (b)}{\cos (b)})}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Cancela el factor común de $\cos (b)$ .

Toca para ver más pasos...

Mueve el signo menos inicial en $- \frac{\sin (b)}{\cos (b)}$ al numerador.

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \cos (b) \sin (b) \sin (a) \frac{- \sin (b)}{\cos (b)}}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Factoriza $\cos (b)$ de $\cos (a) \cos (b) \sin (b) \sin (a)$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (b) (\cos (a) \sin (b) \sin (a)) \frac{- \sin (b)}{\cos (b)}}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Cancela el factor común.

Reescribe la expresión.

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (b) \sin (a) (- \sin (b))}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Eleva $\sin (b)$ a la potencia de $1$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- ({\sin (b)}^{1} \sin (b)))}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Eleva $\sin (b)$ a la potencia de $1$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- ({\sin (b)}^{1} {\sin (b)}^{1}))}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Usa la regla de la potencia $a^{m} a^{n} = a^{m + n}$ para combinar exponentes.

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{1 + 1})}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Suma $1$ y $1$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) \cos (b) \sin (b) \sin (a) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Cancela el factor común de $\sin (b)$ .

Toca para ver más pasos...

Factoriza $\sin (b)$ de $\cos (a) \cos (b) \sin (b) \sin (a)$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\sin (b) (\cos (a) \cos (b) \sin (a)) \frac{\cos (b)}{\sin (b)} + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Cancela el factor común.

Reescribe la expresión.

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) \cos (b) \sin (a) \cos (b) + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Eleva $\cos (b)$ a la potencia de $1$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) ({\cos (b)}^{1} \cos (b)) \sin (a) + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Eleva $\cos (b)$ a la potencia de $1$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) ({\cos (b)}^{1} {\cos (b)}^{1}) \sin (a) + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Usa la regla de la potencia $a^{m} a^{n} = a^{m + n}$ para combinar exponentes.

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{1 + 1} \sin (a) + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Suma $1$ y $1$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{2} \sin (a) + \cos (a) \cos (b) \sin (b) \sin (a) (- \frac{\cos (a)}{\sin (a)})}$

Cancela el factor común de $\sin (a)$ .

Toca para ver más pasos...

Mueve el signo menos inicial en $- \frac{\cos (a)}{\sin (a)}$ al numerador.

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{2} \sin (a) + \cos (a) \cos (b) \sin (b) \sin (a) \frac{- \cos (a)}{\sin (a)}}$

Factoriza $\sin (a)$ de $\cos (a) \cos (b) \sin (b) \sin (a)$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{2} \sin (a) + \sin (a) (\cos (a) \cos (b) \sin (b)) \frac{- \cos (a)}{\sin (a)}}$

Cancela el factor común.

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{2} \sin (a) + \sin (a) (\cos (a) \cos (b) \sin (b)) \frac{- \cos (a)}{\sin (a)}}$

Reescribe la expresión.

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{2} \sin (a) + \cos (a) \cos (b) \sin (b) (- \cos (a))}$

Eleva $\cos (a)$ a la potencia de $1$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{2} \sin (a) + \cos (b) \sin (b) (- ({\cos (a)}^{1} \cos (a)))}$

Eleva $\cos (a)$ a la potencia de $1$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{2} \sin (a) + \cos (b) \sin (b) (- ({\cos (a)}^{1} {\cos (a)}^{1}))}$

Usa la regla de la potencia $a^{m} a^{n} = a^{m + n}$ para combinar exponentes.

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{2} \sin (a) + \cos (b) \sin (b) (- {\cos (a)}^{1 + 1})}$

Suma $1$ y $1$ .

$\frac{\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{2} \sin (a) + \cos (b) \sin (b) (- {\cos (a)}^{2})}$

Factoriza $\sin (b) \sin (a)$ de $\cos (b) \sin (b) {\sin (a)}^{2} + \cos (a) \sin (a) (- {\sin (b)}^{2})$ .

Toca para ver más pasos...

Factoriza $\sin (b) \sin (a)$ de $\cos (b) \sin (b) {\sin (a)}^{2}$ .

$\frac{\sin (b) \sin (a) (\cos (b) \sin (a)) + \cos (a) \sin (a) (- {\sin (b)}^{2})}{\cos (a) {\cos (b)}^{2} \sin (a) + \cos (b) \sin (b) (- {\cos (a)}^{2})}$

Factoriza $\sin (b) \sin (a)$ de $\cos (a) \sin (a) (- {\sin (b)}^{2})$ .

$\frac{\sin (b) \sin (a) (\cos (b) \sin (a)) + \sin (b) \sin (a) (\cos (a) (- \sin (b)))}{\cos (a) {\cos (b)}^{2} \sin (a) + \cos (b) \sin (b) (- {\cos (a)}^{2})}$

Factoriza $\sin (b) \sin (a)$ de $\sin (b) \sin (a) (\cos (b) \sin (a)) + \sin (b) \sin (a) (\cos (a) (- \sin (b)))$ .

$\frac{\sin (b) \sin (a) (\cos (b) \sin (a) + \cos (a) (- \sin (b)))}{\cos (a) {\cos (b)}^{2} \sin (a) + \cos (b) \sin (b) (- {\cos (a)}^{2})}$

Factoriza $\cos (a) \cos (b)$ de $\cos (a) {\cos (b)}^{2} \sin (a) + \cos (b) \sin (b) (- {\cos (a)}^{2})$ .

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Factoriza $\cos (a) \cos (b)$ de $\cos (a) {\cos (b)}^{2} \sin (a)$ .

$\frac{\sin (b) \sin (a) (\cos (b) \sin (a) + \cos (a) (- \sin (b)))}{\cos (a) \cos (b) (\cos (b) \sin (a)) + \cos (b) \sin (b) (- {\cos (a)}^{2})}$

Factoriza $\cos (a) \cos (b)$ de $\cos (b) \sin (b) (- {\cos (a)}^{2})$ .

$\frac{\sin (b) \sin (a) (\cos (b) \sin (a) + \cos (a) (- \sin (b)))}{\cos (a) \cos (b) (\cos (b) \sin (a)) + \cos (a) \cos (b) (\sin (b) (- \cos (a)))}$

Factoriza $\cos (a) \cos (b)$ de $\cos (a) \cos (b) (\cos (b) \sin (a)) + \cos (a) \cos (b) (\sin (b) (- \cos (a)))$ .

$\frac{\sin (b) \sin (a) (\cos (b) \sin (a) + \cos (a) (- \sin (b)))}{\cos (a) \cos (b) (\cos (b) \sin (a) + \sin (b) (- \cos (a)))}$

Reordena los términos.

$\frac{\sin (b) \sin (a) (\cos (b) \sin (a) - 1 \cdot \cos (a) \sin (b))}{\cos (a) \cos (b) (\cos (b) \sin (a) - 1 \cdot \sin (b) \cos (a))}$

Cancela el factor común de $\cos (b) \sin (a) - 1 \cdot \cos (a) \sin (b)$ y $\cos (b) \sin (a) - 1 \cdot \sin (b) \cos (a)$ .

$\frac{\sin (b) \sin (a)}{\cos (a) \cos (b)}$

Step 4

Reordena los términos.

$\frac{\sin (a) \sin (b)}{\cos (a) \cos (b)}$

Step 5

Reescribe $\frac{\sin (a) \sin (b)}{\cos (a) \cos (b)}$ como $\frac{\tan (b)}{\cot (a)}$ .

$\frac{\tan (b)}{\cot (a)}$

Step 6

Debido a que se ha demostrado que los dos lados son equivalentes, la ecuación es una identidad.

$\frac{\tan (a) - \tan (b)}{\cot (b) - \cot (a)} = \frac{\tan (b)}{\cot (a)}$ es una identidad