$\int\frac{1}{\sin^2\left(x\right)\cos^2\left(x\right)}dx$

$\pi-\frac{1}{4}$

$5\left(b+20\right)$

$\left(5+i\right)\left(5-i\right)$

$12\cos\left(x\right)+24+12\sin\left(x\right)-\frac{5}{\sin\left(x\right)}$

$\frac{1}{x+3}-\frac{1}{3x-4}=\frac{1}{12x+12}$

$\lim_{x\to-1}\left(5x^2+x-1\right)$