Trigonometry Examples

$2 \cos^{2} (22.5 - 1)$

Step 1

Subtract $1$ from $22.5$ .

$2 \cos^{2} (21.5)$

Step 2

The result can be shown in multiple forms.

Exact Form:

$2 \cos^{2} (21.5)$

Decimal Form:

$1.73135370 \dots$