Search results:
66.
$\int \cos^3x dx = \dfrac{1}{12}\sin 3x +\dfrac{3}{4}\sin x + C$
68.
$\int \dfrac{dx}{\cos x}=\ln\left|\tan\left(\frac{x}{2}+\frac{\pi}{4}\right)\right|+C$
71.
$\int \dfrac{dx}{\sin^3x} =-\dfrac{\cos x}{2 \sin^2x}+\dfrac{1}{2}\ln\left|\tan\dfrac{x}{2}\right|+C$
72.
$\int \dfrac{dx}{\cos^3x}=\dfrac{\sin x}{2 \cos^2x}+\dfrac{1}{2}\ln\left|\tan\left(\frac{x}{2}+\frac{\pi}{4}\right)\right|+C$
79.
$\int \dfrac{\sin^2x}{\cos x}dx=\ln\left|\tan\left(\frac{x}{2}+\frac{\pi}{4}\right)\right|-\sin x +C$