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OpenStudy (anonymous):
prove sin4x=2sincos2x
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OpenStudy (anonymous):
sin(2x+2x)=sin2xos2x+cos2xsin2x=2sin2xcos2x
OpenStudy (anonymous):
Of course. Thank you.
OpenStudy (lgbasallote):
@shivamsinha...you proved that sin(4x) = 2sin(2x)cos(2x)...not 2sincos(2x)...he wanted the latter
OpenStudy (anonymous):
he mistypd it...
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