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Test whether the following funtions are ...

Test whether the following funtions are increasing or decreasing :
`f(x)=x-(1)/(x), x in R, x ne 0`.

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The correct Answer is:
increasing for all `x in R`, where `x ne 0`.
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NAVNEET PUBLICATION - MAHARASHTRA BOARD-APPLICATIONS OF DERIVATIVES -Examples for Practice
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  8. Find the values of x if f(x)=(x)/(x^(2)+1) is a decreasing function.

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