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If fk(x)=1/k(sin^kx+cos^kx) then f4(x)-f...

If `f_k(x)=1/k(sin^kx+cos^kx)` then `f_4(x)-f_6 (x)=` (A) `1/12` (B) `5/12` (C) `(-1)/12` (D) `-5/12`

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JEE MAINS PREVIOUS YEAR ENGLISH-JEE MAINS-All Questions
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