Question

If $y=cosx$ then $x=\frac{\pi }{2}$, $y$ is equal to:

• A. $-1$
• B. $1$
• C. $0$
• D. $\frac{1}{2}$

Answer 1

The correct option is C $0$

$y=\cos x\left(\text{Given}\right)$

For $x=\frac{\pi }{2}$,

$y=\cos \left(\frac{\pi }{2}\right)=0$

Hence the correct answer is $0$.