Question

PLEASE HELP ME I WILL MARK U AS AN BRAINLIST​

Answer 1

solution:

[{cos(x+y)}= cosx cosy-sinx siny]

LHS

cos[π/3+x]=cosπ/3 cosx - sin π/3 sinx

= 1/2 cosx - √3/2 sinx

= 1/2 [ cosx - √3 sinx]= RHS

i hope ! i have helped you.