$31z^{14}20z^7$

$\int\frac{tan^2\left(x\right)}{sec^4\left(x\right)}dx$

$4d-d+6-6d$

$\lim_{x\to\infty}\left(\frac{\cos\left(x\right)-\cos\left(\sin\left(2x\right)\right)}{x^2}\right)$

$\:\int_0^{\frac{1}{2}}\:cos^3\left(\pi\:\:x\right)sin\left(\pi\:\:x\right)dx$

$\frac{d}{dx}\frac{e^x}{5x+4}$

$48c+23c-50c$