Question

2 sin x cos x = ?

cos 2x
sin 2x
\sin ^{2} xsin
2
x
\cos ^{2} xcos
2
x

Answer 1

Answer:

sin(2x) = 2 sin(x) cos(x) cos(2x) = cos2(x) – sin2(x) = 1 – 2 sin2(x) = 2 cos2(x) – 1.