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Question

Find the derivative of the following:
(5x3+3x1)(x1).

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Solution

Let f(x)=(5x3+3x1)(x1)
Thus using product rule of differentiation,
f(x)=(5x3+3x1)ddx(x1)+(x1)ddx(5x3+3x1)
=(5x3+3x1)(1)+(x1)(5.3x2+30)
=(5x3+3x1)+(x1)(15x2+3)
=5x3+3x1+15x3+3x15x23
=20x315x2+6x4

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