definite-integral

Question: $\int_{0}^{\pi /6}{\frac{\sin x}{{{\cos }^{3}}x}\,dx=}$



1) $\frac{2}{3}$
2) $\frac{1}{6}$
3) 2
4) $\frac{1}{3}$
Solution: Explanation: No Explanation
Fundamental definite integration Definite integration by substitution

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