$\int_{-a}^0e^xdx$

$\left(1+\tan\left(b\right)+\sec\left(b\right)\right)\cdot\left(1+\cot\left(b\right)-\csc\left(b\right)\right)$

$\left(\frac{t-2}{2.5-2}\cdot\frac{t-4}{2.5-4}\right)$

$x^2-2xy^3=x-3$

$\frac{3x}{x+2}+\frac{5x}{x-2}-\frac{40}{x^2-4}$

$\arctan\left(5x^4\right)\csc\left(3x\right)$

$\log\left(\frac{z}{x^6}\right)$