Trigonometría Ejemplos

$(\cos (x) + \sin (x)) (1 - \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

Step 1

Simplifica $(\cos (x) + \sin (x)) (1 - \cos (x) \sin (x))$ .

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Expande $(\cos (x) + \sin (x)) (1 - \cos (x) \sin (x))$ con el método PEIU (primero, exterior, interior, ultimo).

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Aplica la propiedad distributiva.

$\cos (x) (1 - \cos (x) \sin (x)) + \sin (x) (1 - \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

Aplica la propiedad distributiva.

$\cos (x) \cdot 1 + \cos (x) (- \cos (x) \sin (x)) + \sin (x) (1 - \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

Aplica la propiedad distributiva.

$\cos (x) \cdot 1 + \cos (x) (- \cos (x) \sin (x)) + \sin (x) \cdot 1 + \sin (x) (- \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

Simplifica cada término.

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Multiplica $\cos (x)$ por $1$ .

$\cos (x) + \cos (x) (- \cos (x) \sin (x)) + \sin (x) \cdot 1 + \sin (x) (- \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

Reescribe con la propiedad conmutativa de la multiplicación.

$\cos (x) - \cos (x) \cos (x) \sin (x) + \sin (x) \cdot 1 + \sin (x) (- \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

Multiplica $- \cos (x) \cos (x)$ .

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

$\cos (x) - (\cos^{1} (x) \cos (x)) \sin (x) + \sin (x) \cdot 1 + \sin (x) (- \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

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

$\cos (x) - (\cos^{1} (x) \cos^{1} (x)) \sin (x) + \sin (x) \cdot 1 + \sin (x) (- \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

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

$\cos (x) - {\cos (x)}^{1 + 1} \sin (x) + \sin (x) \cdot 1 + \sin (x) (- \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

Suma $1$ y $1$ .

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) \cdot 1 + \sin (x) (- \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

Multiplica $\sin (x)$ por $1$ .

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) + \sin (x) (- \cos (x) \sin (x)) = \sin^{3} (x) + \cos^{3} (x)$

Reescribe con la propiedad conmutativa de la multiplicación.

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin (x) \cos (x) \sin (x) = \sin^{3} (x) + \cos^{3} (x)$

Multiplica $- \sin (x) \cos (x) \sin (x)$ .

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

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - (\sin^{1} (x) \sin (x)) \cos (x) = \sin^{3} (x) + \cos^{3} (x)$

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

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - (\sin^{1} (x) \sin^{1} (x)) \cos (x) = \sin^{3} (x) + \cos^{3} (x)$

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

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - {\sin (x)}^{1 + 1} \cos (x) = \sin^{3} (x) + \cos^{3} (x)$

Suma $1$ y $1$ .

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin^{3} (x) + \cos^{3} (x)$

Step 2

Simplifica $\sin^{3} (x) + \cos^{3} (x)$ .

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Dado que ambos términos son cubos perfectos, factoriza con la fórmula de la suma de cubos, $a^{3} + b^{3} = (a + b) (a^{2} - a b + b^{2})$ , donde $a = \sin (x)$ y $b = \cos (x)$ .

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = (\sin (x) + \cos (x)) (\sin^{2} (x) - \sin (x) \cos (x) + \cos^{2} (x))$

Mueve $\cos^{2} (x)$ .

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = (\sin (x) + \cos (x)) (\sin^{2} (x) + \cos^{2} (x) - \sin (x) \cos (x))$

Aplica la identidad pitagórica.

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = (\sin (x) + \cos (x)) (1 - \sin (x) \cos (x))$

Expande $(\sin (x) + \cos (x)) (1 - \sin (x) \cos (x))$ con el método PEIU (primero, exterior, interior, ultimo).

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Aplica la propiedad distributiva.

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) (1 - \sin (x) \cos (x)) + \cos (x) (1 - \sin (x) \cos (x))$

Aplica la propiedad distributiva.

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) \cdot 1 + \sin (x) (- \sin (x) \cos (x)) + \cos (x) (1 - \sin (x) \cos (x))$

Aplica la propiedad distributiva.

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) \cdot 1 + \sin (x) (- \sin (x) \cos (x)) + \cos (x) \cdot 1 + \cos (x) (- \sin (x) \cos (x))$

Simplifica cada término.

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Multiplica $\sin (x)$ por $1$ .

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) + \sin (x) (- \sin (x) \cos (x)) + \cos (x) \cdot 1 + \cos (x) (- \sin (x) \cos (x))$

Reescribe con la propiedad conmutativa de la multiplicación.

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - \sin (x) \sin (x) \cos (x) + \cos (x) \cdot 1 + \cos (x) (- \sin (x) \cos (x))$

Multiplica $- \sin (x) \sin (x)$ .

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

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - (\sin^{1} (x) \sin (x)) \cos (x) + \cos (x) \cdot 1 + \cos (x) (- \sin (x) \cos (x))$

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

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - (\sin^{1} (x) \sin^{1} (x)) \cos (x) + \cos (x) \cdot 1 + \cos (x) (- \sin (x) \cos (x))$

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

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - {\sin (x)}^{1 + 1} \cos (x) + \cos (x) \cdot 1 + \cos (x) (- \sin (x) \cos (x))$

Suma $1$ y $1$ .

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - \sin^{2} (x) \cos (x) + \cos (x) \cdot 1 + \cos (x) (- \sin (x) \cos (x))$

Multiplica $\cos (x)$ por $1$ .

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - \sin^{2} (x) \cos (x) + \cos (x) + \cos (x) (- \sin (x) \cos (x))$

Reescribe con la propiedad conmutativa de la multiplicación.

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - \sin^{2} (x) \cos (x) + \cos (x) - \cos (x) \sin (x) \cos (x)$

Multiplica $- \cos (x) \sin (x) \cos (x)$ .

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

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - \sin^{2} (x) \cos (x) + \cos (x) - (\cos^{1} (x) \cos (x)) \sin (x)$

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

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - \sin^{2} (x) \cos (x) + \cos (x) - (\cos^{1} (x) \cos^{1} (x)) \sin (x)$

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

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - \sin^{2} (x) \cos (x) + \cos (x) - {\cos (x)}^{1 + 1} \sin (x)$

Suma $1$ y $1$ .

$\cos (x) - \cos^{2} (x) \sin (x) + \sin (x) - \sin^{2} (x) \cos (x) = \sin (x) - \sin^{2} (x) \cos (x) + \cos (x) - \cos^{2} (x) \sin (x)$

Step 3

Grafica cada lado de la ecuación. La solución es el valor x del punto de intersección.

$x \approx 0, - 0.1, 0.1, - 0.3, 0.3, - \frac{2}{5}, \frac{2}{5}$

Step 4