The function \[f(x)={{\sin }^{4}}x+{{\cos }^{4}}x\] increases, if [IIT 1999; Pb. CET 2001]

\[\frac{3\pi }{8}<x<\frac{5\pi }{8}\]

The function \[f(x)={{\sin }^{4}}x+{{\cos }^{4}}x\] increases, if [IIT

1.	The function \[f(x)={{\sin }^{4}}x+{{\cos }^{4}}x\] increases, if [IIT 1999; Pb. CET 2001]
A.	\[0<x<\frac{\pi }{8}\]
B.	\[\frac{\pi }{4}<x<\frac{3\pi }{8}\]
C.	\[\frac{3\pi }{8}<x<\frac{5\pi }{8}\]
D.	\[\frac{5\pi }{8}<x<\frac{3\pi }{4}\]
Answer» C. \[\frac{3\pi }{8}<x<\frac{5\pi }{8}\]

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The function \[f(x)={{\sin }^{4}}x+{{\cos }^{4}}x\] increases, if [IIT 1999; Pb. CET 2001]

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