$-\left(-2\right)+\left(-3\right)-4$

$\int\left(e^{-\pi x^2}\right)dx$

$2\csc^2x-\csc x=1$

$\frac{dy}{dx}=\frac{x}{3y^2+3x^2y^2}$

$\left(256\right)^2-\left(255\right)^2$

$8+9\left(2y+10\right)$

$\lim_{x\to0}\left(\frac{ln\left(1+x^2\right)}{e^x-\cos\left(x\right)}\right)$