Let $f_{K}(x)=\frac{1}{k}\left(\sin ^{k} x+\cos ^{k} x\right)$ where $x \in R$ and $k \geq 1 .$ Then $f_{4}(x)-f_{6}(x)$ equals :
$\frac{1}{6}$
$\frac{1}{3}$
$\frac{1}{4}$
$\frac{1}{12}$
Correct Option: , 4
Leave a comment
All Study Material
