buktikanlah sin(x+y)+sin(x-y)=2 sin x cos y
Matematika
nurcifa
Pertanyaan
buktikanlah sin(x+y)+sin(x-y)=2 sin x cos y
1 Jawaban
-
1. Jawaban dharmawan12
sin(x + y)+ sin (x - y)
= sinx cos y + cosx siny + sinx cosy - cosx sin y
= sinx cosy + sinx cosy + cosx sin y -cosx siny
= 2sin x cos y