1. $\int \frac{dx}{1+3{\cos }^{2}x}=\text{কত? }$

• A. $\frac{1}{2}{\tan }^{-1}\left(\frac{\tan x}{2}\right)+c$
• B. $\frac{1}{2}{\tan }^{-1}\left(\frac{\tan x}{2}\right)+c$
• C. $\frac{1}{2}{\tan }^{-1}\left(\frac{\tan x}{2}\right)+c$
• D. $\frac{1}{2}{\tan }^{-1}\left(\frac{\tan x}{2}\right)+c$

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