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Find the derivative of f(x) = x^2 sin(x)
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and since cos(x) + sin(x) I came up with
But that was wrong.
So no you can't do that
That is not an identity
And even if it was you do not have cos(x)+sin(x)
you have acos(x)+bsin(x)
\[x^2\cos(x)+2x \sin(x)=x(xcos(x)+2 \sin(x))\]
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53 seconds ago