$\lim_{x\to2}\:\frac{\left(x^2-1\right)e^{x^2}}{\left(x-2\right)}$

$\frac{24x^3y^2}{18xy^3}=\frac{4x^2}{3y}$

$\left(-27\right)\:\frac{4}{3}$

$7y-8\cdot7y-8$

$\left(3w+11\right)\left(3w-5\right)$

$\frac{\sin\left(x\right)}{1-\sec^2\left(x\right)}=-\cot\left(x\right)\cos\left(x\right)$

$-6n^2-3f+5n^2+16f$