Question

Rewrite with only sin x and cos x.

sin 2x - cos x

Answer 1

Recall the `Sine Double Angle Identity`:\[\large \color{green}{\sin 2x=2\sin x \cos x}\]

Understand how you can use this to deal with the sin2x in your problem? :)

Answer 2

here are the options

2 sin x cos2x

sin x

cos x (2 sin x - 1)

2 sin x

Answer 3

no i don't understand?

Answer 4

\[\large \color{green}{\sin 2x}-\cos x\]Using the identity I pasted above we can rewrite our equation as,\[\large \color{green}{2\sin x\cos x}-\cos x\]
From here we can factor out a cosx from each term.
What would that give you? :o

Answer 5

no the 3rd one

Answer 6

right?

Answer 7

lol i have a feeling you're just guessing XD

Answer 8

No i really think it's the 3rd one

Answer 9

Ok, good job :D ya it's the third one.