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

$4x^2-12x-1$

$\int\left(\frac{9x-24}{2x^2-13x+15}\right)dx$

$2x^2y^3z\:+3x^2y^3z$

$9^4\cdot9^{-4}$

$\cos\left(110\right)\cos\left(40\right)-\sin\left(110\right)\sin\left(40\right)$

$\int x^3\cos\left(x^4\:+\:2\right)dx$