$\frac{dy}{dx}+500y=1200\sin\left(60x\right)$

$y'\left(x\right)=xy+x+y+1;y'\left(0\right)=-1$

$-3c+-7+-8+-9c^2$

$\frac{x^2}{a}\cdot\frac{\left(1-x\right)}{a+1}$

$\left(x+2y\right)\left(2x+y\right)$

$\:15-21-\left(-3\right)-\:\left(-32+\left(-27\right)+\left(-11\right)\right)$

$\frac{d^2y}{dx^2}\left(5x^2+y^2\right)$