Algebra Examples

$\cos^{2} (10 °) - \sin^{2} (10 °)$

Step 1

Apply the cosine double-angle identity.

$\cos (2 \cdot 10 °)$

Step 2

Multiply $2$ by $10 °$ .

$\cos (20)$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\cos (20)$

Decimal Form:

$0.93969262 \dots$

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