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Question

The value of dydx if y=(x1)2(x+2)3 is equal to

A
y(x12+x+23]
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B
y.(2(x1)+3(x+2)]
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C
2x1+x+23
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D
y(2x1+3x+2]
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Solution

The correct option is D y(2x1+3x+2]

y=(x1)2(x+2)3

Taking logarithm,ln y=2 ln(x1)+3 ln(x+2)

Differentiating both sides.

1y.y=2(x1)+3x+2 (Chain rule is applied on the LHS)

y=y[2x1+3x+2]


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