indefinite-integration

Question: $\int_{{}}^{{}}{\tan x}{{\sec }^{2}}x\sqrt{1-{{\tan }^{2}}x}\ dx=$

1) $-\frac{1}{3}{{(1-{{\tan }^{2}}x)}^{3/2}}+c$

2) $\frac{1}{3}{{(1-{{\tan }^{2}}x)}^{3/2}}+c$

3) $-\frac{2}{3}{{(1-{{\tan }^{2}}x)}^{2/3}}+c$

4) None of these

Solution:

Explanation: No Explanation

Integration by substitution

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