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$\int \frac{d x}{1 + 3 c o s^{2} x} =$ কত?

\frac{1}{2} t a n^{- 1} (\frac{t a n x}{2}) + c

\frac{1}{3} t a n^{- 1} (\frac{t a n x}{2}) + c

2 t a n^{- 1} (\frac{t a n x}{2}) + c

t a n^{- 1} (e x) + c

ANS : 1

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