$3x-6\left(5\right)$

$9^2-7\left(9\right)-30$

$\lim_{x\to\pi}\left(\frac{x}{2}\right)csc\left(x\right)$

$\lim_{x\to0}\left(\frac{e^{5x\:}-1}{\sin\left(x\right)}\right)$

$\left(3x+2+5y\right)\left(3x+2-5y\right)$

$\int\frac{x^2-3x+6}{\left(x+2\right)\left(x^2+4\right)}dx$

$-y-4y+2^2$