Question

Rewrite with only sin x and cos x.

sin 2x - cos 2x

Answer 1

2(sin x - cos x )= 0
sin x - cos x = 0
sin x = cos x
did you have the answer ??

Answer 2

no I do not know the answer! the choices are

A. 2 sin^2 x - 2 sin x cos x + 1

2 sin x

2 sin^2 x + 2 sin x cos x - 1

2 sin^2 x - 2 sin x cos x - 1

Answer 3

Wait...you can't just factor out a 2 like that. You could, I guess, if it were 2 sin x - 2 cos x, but the 2 is "inside" the sine and cosine function.

Answer 4

So what should I do?

Answer 5

There are identities for sin 2x and cos 2x. Do you know them? Or maybe you could use the formula for sin(x+y) and cos(x+y), if you know that.

Answer 6

What would the answer be?

Answer 7

im guessing the third but im not sure

Answer 8

Sin 2x = 2 sin x cos x
Cos 2x = cos^x - sin^x

Answer 9

that is not one of the answers though

Answer 10

Im taking a timed test on my virtual class right now , thats why i need help