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OpenStudy (anonymous):
(cosx+sinx)^2-(cosx-sinx)^2=2sinx(2x) Verify
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OpenStudy (anonymous):
this is the last question tonight. i am so tired.:(
OpenStudy (anonymous):
left side is 4 cos xsinx
OpenStudy (anonymous):
sin2x= 2cosxsinx. so it should be equal to 2 sin(2x), not sinx(2x).
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