\[\int_{\ -\pi }^{\pi }{\frac{{{\sin }^{4}}x}{{{\sin }^{4}}x+{{\cos }^{4}}x}\ dx}=\] [Kerala (Engg.) 2005]

\[\int_{\ -\pi }^{\pi }{\frac{{{\sin }^{4}}x}{{{\sin }^{4}}x+{{\cos }^

1.	\[\int_{\ -\pi }^{\pi }{\frac{{{\sin }^{4}}x}{{{\sin }^{4}}x+{{\cos }^{4}}x}\ dx}=\] [Kerala (Engg.) 2005]
A.	\[\pi /4\]
B.	\[\pi /2\]
C.	\[3\pi /2\]
D.	\[2\pi \]
E.	\[\pi \]
Answer» F.

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\[\int_{\ -\pi }^{\pi }{\frac{{{\sin }^{4}}x}{{{\sin }^{4}}x+{{\cos }^{4}}x}\ dx}=\] [Kerala (Engg.) 2005]

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