If the function y = sin (x + &) (0 ≤ & ≤ π) is an even function on R, then what is the number of

If the function y = sin (x + &) (0 ≤ & ≤ π) is an even function on R, then what is the number of

Because COS is an even function, we can get it by sin (x + pi / 2) = cos (PI)