Question

Rewrite with only sin x and cos x.

sin 2x - cos x

Answer 1

sin(2x) = 2sinx cosx

2sinx cosx - cosx

Answer 2

Here is a double angle formula for sinx\[\sin2x=2sinxcosx\]that will allow you to eliminate the (2x) inside the sine function

Answer 3

This ^^.

Answer 4

i don't understand how to do it though .

Answer 5

Just replace sin(2x) with 2sin(x)cos(x).

Answer 6

They are equivalent.

Answer 7

2 sin x cos2x

sin x

cos x (2 sin x - 1)

2 sin x

Answer 8

those are my answer choices

Answer 9

Simplify the result given earlier.

Answer 10

i don't know how to......

Answer 11

As xxferocixx said above, once you make the substitution for sin(2x), you get
2sinx cosx - cosx
in which both terms have cosx in common... try factoring it out. What do you get?