Precalculus Examples

$\cos^{2} (37) - \sin^{2} (37)$

Step 1

Apply the cosine double-angle identity.

$\cos (2 \cdot 37)$

Step 2

Multiply $2$ by $37$ .

$\cos (74)$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\cos (74)$

Decimal Form:

$0.27563735 \dots$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$