$in\:\left(t^3+3t\right)$

$\lim_{x\to-\infty}x\left(\frac{x}{\sqrt{x^2+1}}-1\right)$

$e=\left(x-2\right)^2+2\left(2x-3\right)-\left(x^2+1\right)+3$

$\frac{\csc\left(x\right)-\sec\left(x\right)}{1-\cot\left(x\right)}$

$5\left(2y-7\right)=15$

$2x^3-x^2-18x+9$

$\frac{1}{x^8}\:\left(x^{11}\right)$