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OpenStudy (anonymous):
sin(x)+2cos(x)
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OpenStudy (anonymous):
what exactly is yr question
OpenStudy (anonymous):
sin(2x) = 2sinxcosx which derives from the sum of two angles: sin(a+b) = sin(a)cos(b) + cos(a)sin(b) If a = b, then a+b = 2a sin(a+b) = sin(2a) = sin(a)cos(a) + cos(a)sin(a) = 2sin(a)cos(a)
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