$\lim_{x\to0}\sin\left(x\right)\ln\cos\left(x\right)$

$2x-\left(3x^2\left(2x+5x^3-x^4+2\right)\right)-2$

$\left(-12\right)\:-\:\left(-6\right)\:-\:\left(-2\right)\:-\:\left(-1\right)$

$\int\left(5x-2\right)e^{3x}\:\:dx$

$\frac{sec\left(x\right)+tan\left(x\right)}{sec\left(x\right)-tan\left(x\right)}=\left(secx+tanx\right)^2$

$\cos\left(2x\right)=\frac{1-\tan\left(x\right)^2}{1+\tan\left(+\right)^2}$

$\frac{3x^2+4x+5}{x+5}$