The integral $\int\limits_{\pi /6}^{\pi /3} {{{\sec }^{2/3}}} x\cos e{c^{4/3}}xdx$ is equal to :

Question

${3^{{5 \over 3}}} - {3^{{1 \over 3}}}$

${3^{{5 \over 6}}} - {3^{{2 \over 3}}}$

${3^{{4 \over 3}}} - {3^{{1 \over 3}}}$

${3^{{7 \over 6}}} - {3^{{5 \over 6}}}$

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