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Trigonometry
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OpenStudy (anonymous):
prove: sin 2 theta= 2sin theta * cos theta
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OpenStudy (freckles):
What can you use to prove this? Like what are we allowed to use?
OpenStudy (freckles):
are we allowed to use sin(A+B)=sin(A)cos(B)+sin(B)cos(A) a.k.a the sum identity for sine?
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