3. Find a af Je ду əx (a) f= sin(3x + 4y) (b) f = tan( 4x + 5y) (c ) f= log(x+ 3y)

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A: Given query is to find indicated derivative.

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A: we already have f'(x)=-sinx-3sec²x so,f'(4) =-sin(4) -3sec2(4)

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A: The answer is given below

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A: Topic- roots of polynomial

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A: Here I am attaching image so that you understand each and every step.

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A:

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