Question

True or false sin x cos y=1/2(sin(x+y)+sin(x-y))

Answer 1

Answer:

Step-by-step explanation:

hello :

sin(x+y)= sinxcosy+cosxsiny...(*)

sin(x-y)= sinxcosy-cosxsiny....(**)

add (*) and(**) : sin(x+y)+sin(x-y)= 2sinxcosy

1/2(sin(x+y)+sin(x-y)) = sinxcosy......true