$\int\left(\frac{x^2}{sqrt\left(4\:-\:x^2\right)}\right)dx$

$x+3y+8+7x-2y-5$

$-\left(-213\right)-\left(675\right)+\left(-536\right)-\left(894\right)+\left(29\right)$

$\frac{t}{\left(3t-1\right)^2-1}$

$\left(1-x\right)\frac{dy}{dx}=y^2$

$\frac{d}{dx}\left(1-\ln\left(3^{x^2+x}-\sqrt{4x-1}\right)\right)$

$\frac{dy}{dx}=4e^{x-y},y\left(0\right)=ln6$