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Which of the following functions are dec...

Which of the following functions are decreasing on `(0,\ pi//2)` ? (i) `cosx` (ii) `cos2x` (iii) `tanx` (iv) `cos3x`

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RD SHARMA ENGLISH-INCREASING AND DECREASING FUNCTION -All Questions
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  15. Find the intervals in which f(x)=x^2+2x-5 is increasing or decreasing.

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  19. Find the intervals in which f(x)=8+36 x+3x^2-2x^3 is increasing or dec...

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  20. Find the intervals in which f(x)=5x^3-15 x^2-120 x+3 is increasing or ...

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