$\int_0^{0.5}\frac{1}{\sqrt{1-x^2}}dx$

$e^x-e^x$

$\frac{d}{dx}\left(sin\left(y\right)-cos\left(x\right)=ln\left(x^2+y^2\right)\right)$

$-x^2-x+5$

$\int_{-2}^{-1}\left(1-\frac{1}{x}\right)^2dx$

$\left(-50\right)\:+\:\left(-100\right)\:-\:\left(-7\right)\:-\:\left(+8\:-\:13\right)$

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