\[\int_{0}^{\pi /6}{\frac{\sin x}{{{\cos }^{3}}x}\,dx=}\] [SCRA 1979]

\[\int_{0}^{\pi /6}{\frac{\sin x}{{{\cos }^{3}}x}\,dx=}\] �

1.	\[\int_{0}^{\pi /6}{\frac{\sin x}{{{\cos }^{3}}x}\,dx=}\] [SCRA 1979]
A.	\[\frac{2}{3}\]
B.	\[\frac{1}{6}\]
C.	2
D.	\[\frac{1}{3}\]
Answer» C. 2

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\[\int_{0}^{\pi /6}{\frac{\sin x}{{{\cos }^{3}}x}\,dx=}\] [SCRA 1979]

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