$\left(2\sin\left(a\right)+\cos\left(a\right)\right)^2$

$\int\left(3x^{3\:}-4x-7\right)e^{-2x}dx$

$\frac{2}{x-1}-\frac{6}{2x+1}=5$

$\frac{d}{dx}\:2y^2+xy+x^2=1\:$

$\int\frac{x}{\left(-9x^2+16\right)}dx$

$\frac{x^2+x-6}{x-3}$

$\int_0^{\pi}\left(\sin\left(x\right)e^{-x}\right)dx$