derivative Find Dxy of y = sinxcosx

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derivative Find Dxy of y = sinxcosx
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Those who got Cos(2x) remember the trig identify Cos^2(x)-Sin^2(x)=Cos(2x)

YooBro
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But some say that it is cos2x and use other methods please tell me which one is correct

shantanupatidar
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my answer is totaly against with your answer

abhay