sin x cos x dx can you answer me this question please
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=(Sinx dx).Cosx +(Cosx dx).Sinx [{using product rule}]
=Cosx.Cosx +[(-Sinx).Sinx ].
{{{Since (d/dx of Sinx=Cosx )&(d/dx of Cosx = -Sinx )
=(Cos^2 x -Sin^2 x )
=Cos 2x.
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