$3\cdot\left(2\cdot\infty+3\right)\cdot\infty^2$

$-4\left(-8y+-7\right)+1$

$\sqrt{\left(2-5\right)}^4$

$\cot\left(x\right)-\cos x=\cot x\left(1-\sin x\right)$

$\left\{2\left[5-\left(2-\frac{14}{2}\right)\right]\right\}+1$

$\frac{dy}{e^x}=xdx$

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