Question

Please Help!
sin2x+______.
1/2(cos(a-b)-cos(a+b))
2 sin x +2 cos x
1-2 sin^2 x
2 sin x cos x

Answer 1

If I am reading your question correctly, you want to know what sin(2x) equals. That is a trigonometric identity, specifically a Double-Angle Identity. The identity is:
sin(2x) = 2sin(x)cos(x)

Answer 2

Thanx!