$\lim_{x\to1}\frac{\left|1-x\right|}{x-1}$
$-3x+4\left(3+x\right)$
$\left(x+4\right)\left(x-4\right)-\left(x-2\right)^2$
$\frac{dy}{dt}=7y$
$\frac{x^2+3x+2}{x^2-1}$
$\csc\left(2\right)a=1+\cot\left(2\right)a$
$2q^3\cdot2q^3$
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