$\left(1-\sin^2a\right)\left(1+\cot^2a\right)=1$

$140.500\cdot10^2^2^2^2$

$\int\left(\frac{x^4}{\left(3-x^5\right)^4}\right)dx$

$\lim_{x\to-4}\:\frac{\sqrt{x^2-9}}{x+4}$

$\lim_{x\to1}\frac{9\sin\left(\pi x\right)}{\ln\left(x^5\right)}$

$\frac{d}{dx}\left(\left(x\right)-ln\left(x\right)-\frac{\pi}{4}\right)$

$\frac{2+\left(-2\right)\left(7\right)}{1+\left(-2\right)}$