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Question

Let g is the inverse function of f and f(x)=x10(1+x2). If g(2)=a then g(2) is equal to

A
5210
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B
1+a2a10
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C
a101+a2
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D
1+a10a2
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Solution

The correct option is B 1+a2a10
g is inverse of function f
f(x)=x10(1+x2)
g(2)=a
g(2)=(1)
g is inverse of function f, then
f(g(a))=x
differentiate with respect to x
f(g(x)).g(x)=1
g(x)=1f(g.(x))
g(2)=1f(g(2))
=1f(a)
=1a101+a2
g(2)=1+a2a10 Ans


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