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IF f(x)=1-x^3-x^5 is decreasing for...

IF `f(x)=1-x^3-x^5` is decreasing for

A

(a) `1lexle5`

B

(b) `xle1`

C

(c) `xge1`

D

(d) All values of x

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The correct Answer is:
D
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