Precalculus Examples

$1 - 2 \sin^{2} (45)$

Step 1

Apply the cosine double-angle identity.

$\cos (2 \cdot 45)$

Step 2

Multiply $2$ by $45$ .

$\cos (90)$

Step 3

The exact value of $\cos (90)$ is $0$ .

$0$

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