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Question

If f(x)=2x21 and y=f(x2) then dydx at x=1 is

A
2
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B
1
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C
2
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D
none of these
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Solution

The correct option is A 2
Given, f(x)=2x21
y=f(x2)
dydx=f(x2)2x
=2x41(2x)
So, (dydx)x=1=2

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