$2x-5x-3$

$\int\sec\left(x\right)\tan\:\left(x\right)dx$

$\left(6m-7n\right)^2$

$\frac{dy}{dx}=\frac{x-1}{\sqrt{x+1}}$

$\int x\left(0.6+\frac{0.1}{\sqrt[3]{x}}\right)dx$

$\lim_{x\to0}\left(\left(1-2x-x^{3}\right)^{\frac{1}{x}}\right)$