Trigonometry Examples

$\cos (A) \csc (A) = \cot (A)$

Step 1

Simplify the left side.

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Step 1.1

Simplify $\cos (A) \csc (A)$ .

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Step 1.1.1

Rewrite $\csc (A)$ in terms of sines and cosines.

$\cos (A) \frac{1}{\sin (A)} = \cot (A)$

Step 1.1.2

Combine $\cos (A)$ and $\frac{1}{\sin (A)}$ .

$\frac{\cos (A)}{\sin (A)} = \cot (A)$

Step 2

Simplify the right side.

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Step 2.1

Rewrite $\cot (A)$ in terms of sines and cosines.

$\frac{\cos (A)}{\sin (A)} = \frac{\cos (A)}{\sin (A)}$

Step 3

Multiply both sides of the equation by $\sin (A)$ .

$\sin (A) \frac{\cos (A)}{\sin (A)} = \sin (A) \frac{\cos (A)}{\sin (A)}$

Step 4

Cancel the common factor of $\sin (A)$ .

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Step 4.1

Cancel the common factor.

$\sin (A) \frac{\cos (A)}{\sin (A)} = \sin (A) \frac{\cos (A)}{\sin (A)}$

Step 4.2

Rewrite the expression.

$\cos (A) = \sin (A) \frac{\cos (A)}{\sin (A)}$

Step 5

Cancel the common factor of $\sin (A)$ .

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Step 5.1

Cancel the common factor.

$\cos (A) = \sin (A) \frac{\cos (A)}{\sin (A)}$

Step 5.2

Rewrite the expression.

$\cos (A) = \cos (A)$

Step 6

For the two functions to be equal, the arguments of each must be equal.

$A = A$

Step 7

Move all terms containing $A$ to the left side of the equation.

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Step 7.1

Subtract $A$ from both sides of the equation.

$A - A = 0$

Step 7.2

Subtract $A$ from $A$ .

$0 = 0$

Step 8

Since $0 = 0$ , the equation will always be true for any value of $A$ .

All real numbers

Step 9

The result can be shown in multiple forms.

All real numbers

Interval Notation:

$(- \infty, \infty)$