Cos(piee/4-thta)cos(piee/4-fiee) -(piee/4-thta)sin (piee/4-fiee) show that sin (thta+fiee)

Cos(piee/4-thta)cos(piee/4-fiee) -(piee/4-thta)sin (piee/4-fiee) show

1.	Cos(piee/4-thta)cos(piee/4-fiee) -(piee/4-thta)sin (piee/4-fiee) show that sin (thta+fiee)
Answer» not QUESTION of PRIMARY SCHOOL.