Sinxcos y = 1 (sin(x + y) + sin(x-y))
sin x COSY -

Step-by-step explanation:

sin (x+y)=sin x cos y+cos x sin y

sin (x-y)=sin x cos y-cos x sin y

add

sin (x+y)+sin (x-y)=2 sin x cos y

sin x cos y=1/2 [sin (x+y)+sin (x-y) ]

x + 4/7

step-by-step explanation:

use cymath