Question

sin 2x = _____ what is the best answer
a. 2sinx + 2cos x
b. 1/2 (cos(a-b) - cos(a+b))
c 2sinx cosx
d 1-2sin^2 x

Answer 1

Hint:\[\rm \sin(\alpha + \beta) = \sin \alpha \cos \beta + \sin \beta \cos \alpha\]You have to find sin(x + x).

Answer 2

um ..what?

Answer 3

Do you know what sin(x + y) is?

Answer 4

Simplify for the answer.