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Letf(4)(x) = (1)/(k) [ sin^(k) + cos^(k)...

Let`f_(4)(x) = (1)/(k) [ sin^(k) + cos^(k) x ] `where x `in RR` and `k ge`1.
then `f_(4)(x) - f_(6)(x)` =

A

`1/4`

B

`1/12`

C

`1/6`

D

`1/3`

Text Solution

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The correct Answer is:
B
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