indefinite-integration

Question: $\int_{{}}^{{}}{\frac{dx}{1+3{{\sin }^{2}}x}=}$

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

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

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

4) None of these

Solution:

Explanation: No Explanation

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