Question

Find the value of cos ($-\frac{7\pi}{2}$)

Answer 1

Here is your Answer:-

Value of
$\cos( - \frac{7\pi}{2} ) = 0 \\ \\ because \\ \cos(n \frac{\pi}{2} ) = 0 \: n \: is \: integer$
➡️➡️Hence,
➡️➡️➡️value will be 0.