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Without using the derivative, show that ...

Without using the derivative, show that the function `f(x)=|x|` is (a) strictly increasing in `(0,\ oo)` (b) strictly decreasing in `(-oo,\ 0)`

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RD SHARMA ENGLISH-INCREASING AND DECREASING FUNCTION -All Questions
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  14. Find the intervals for which f(x)=x^4-2x^2 is increasing or decreasing...

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