Solution :- we have Fla) =5 cas 2x %3D Now di'fferentiate it wot x x d (cos2x) %3D Źx(-2sin2x) %3D f'ca) - Sin 2x first deri'vative - Sin 2x. Ang f'(x) -Sin 22 And Now , differ entiate it wit x f"(x) = -2 Co82x %3D So, Second derivative is -2 Cos2x

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