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OpenStudy (anonymous):
Pre-Cal. A.)sinb B.)sina C.)cosa D.)cosb
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OpenStudy (anonymous):
hartnn (hartnn):
know the formula for sin(a+b) and sin(a-b) ?
OpenStudy (goformit100):
It is the formula of compound angle
OpenStudy (anonymous):
no i dont
hartnn (hartnn):
\(\large \sin(a+b)=\sin a\cos b+\cos a\sin b\\ \large \sin(a-b)=\sin a \cos b -\cos a\sin b\) just plug in and simplify!
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OpenStudy (anonymous):
got sinB
hartnn (hartnn):
i means sin B is not with sin a, what's with sin a ?
OpenStudy (anonymous):
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