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OpenStudy (anonymous):
How ? 1. sin 3x = cos x/3 2. 2sin^2 (x) +4sinxcosx+cos^2 (x)=0 3. sin2x-2sin^2 (x) =2cos2x 4. cos5x+cos7x=sin2x 5. sinxsin5x=sin2xsin6x 6. 4sin^2 (x) +sin^2(2x)=3
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OpenStudy (anonymous):
sin 3x=3sinx-4sin^3x
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