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

$8x^2+9=0$

$2\sec^2\left(30\right)-2\sin\left(30\right)$

$\frac{x^4-x^2-3x+2}{x-2}$

$\int\left(4x^3+5\right)\left(5x^9-3\right)dx$

$\lim_{x\to3}\left(\frac{x^{3}-27}{x-3}\right)$

$c=\sin x\cdot\cot x+\cos x$