MCQShare$\int \frac{d x}{1+36 x^2}=$A$6 \tan ^{-1} 6 x+k$B$3 \tan ^{-1} 6 x+k$✓$\frac{1}{6} \tan ^{-1} 6 x+k$D$\tan ^{-1} 6 x+k$