Asked by Anonymous

How to simplify

4sin[pi/2 + x] ?
Answered by Reiny
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
Answered by Anonymous
Thank you!
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