How to simplify

Question

4sin[pi/2 + x] ?

Answer 1

using
sin(A+B) = sinAcosB + cosAsinB

4sin(π/2+x)
= 4(sin(π/2)cosx + cos(π/2)sinx)
= 4( (1)cosx + (0)sinx)
= 4 cosx

Answer 2

Thank you!