I don't understand the last step, can someone please explain.
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Step-by-step explanation:
in second last line the derivation of sinx is written as cosx
so,the equation has become
2sinx cosx
and 2sinx cosx is actually an identity
I.e.2sinx cosx=sin2x
that's why in last line it is replaced by sin2x
also there are two 2sinx cosx so they are taken common and then written as:
(x^2-1)2sinx cosx
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