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OpenStudy (anonymous):
Rewrite sin 3x with only sin x and cos x
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OpenStudy (anonymous):
\[\sin(3x) = \sin(x + 2x)\]
OpenStudy (anonymous):
Nw use the formula and expand...
OpenStudy (anonymous):
\[\sin(x+y) = sinx.cosy + cosx.siny\]
OpenStudy (anonymous):
sin x cos2x - sin3x + cos3x?
OpenStudy (anonymous):
@Yahoo!
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