Trigonometry Examples

$\cos (- \frac{π}{5}) \cos (\frac{π}{3}) + \sin (- \frac{π}{5}) \sin (- \frac{π}{3}) = \cos (\frac{π}{5}) \cos (\frac{π}{3}) + \sin (\frac{π}{5}) \sin (\frac{π}{3})$

Step 1

The left side $0.91354545$ is equal to the right side $0.91354545$ , which means that the given statement is always true.

True