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Just add the x's together?

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Oh okay, so what's next?

In this case
a=x
b=2x
And we'll split it up the way I did with the definition above.

\[\large \sin(x+2x)\quad =\quad \sin x \cdot \cos(2x)+\sin(2x)\cdot \cos x\]

Try to compare it to the definition above with the sin(a+b), see if it makes sense or not.

It doesn't really seem like it makes sense

See how we replaced the A and B's? Too much for ya? D:

Well I'm with you so far

Yes I have them in my notes

Alrighty then

Ohh i see

So now just multiply them together and you should have your final answer?

yes.

Yes, I understand, thank you very much :)

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