$\frac{d}{dx}\left(x^2y-x^3+y^4-xy+2\right)$

$\lim_{x\to\infty}\left(100x\right)^{\frac{1}{x}}$

$1+\cos\left(x\right)+\cos\left(2x\right)$

$-7y^4\left(5x^3y\right)$

$-3\left(x^4+2x^2+15\right)$

$\lim_{x\to1}\left(\frac{s^3-1}{s^2-1}\right)$

$8\sin\left(x\right)+3=0$