Trigonometry Examples

$\cos^{2} (\frac{15}{17}) - \sin^{2} (\frac{8}{17})$

Step 1

The result can be shown in multiple forms.

Exact Form:

$\cos^{2} (\frac{15}{17}) - \sin^{2} (\frac{8}{17})$

Decimal Form:

$0.19807045 \dots$