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Given 5f(x)+4f(1/x)=x^2-2 and y=9f(x)x^2...

Given `5f(x)+4f(1/x)=x^2-2` and `y=9f(x)x^2`. An interval on which y is strictly increasing.

A

`(0, frac{1}{sqrt 5}) cup (frac{1}{sqrt 5}, infty)`

B

`(-frac{1}{sqrt 5}, 0) cup (frac{1}{sqrt 5}, infty)`

C

`(-frac{1}{sqrt 5}, 0) cup (0, frac{1}{sqrt 5})`

D

`(- infty, frac{1}{sqrt 5}) cup (0, frac{1}{sqrt 5})`

Text Solution

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The correct Answer is:
B
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