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Rewrite with only sin x and cos x. sin 3x - cos x

Mathematics
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Hint: Expand sin3x by writing it as : sin(x+2x)
Recall 3x=2x+x So sin(3x)=sin(x+2x) Use the formula sin(u+v)=sin(u)cos(v)+sin(v)cos(u) to expand sin(x+2x)
i was thinking that but i wasnt sure

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Other answers:

now all the options i am given have exponents in them how is that possible
That will be the case. sin2x is 2sinxcosx.
i dont understand...

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