$\frac{d^2}{dx^2}3\left(cos\left(4x\right)\right)^2$

$\lim_{x\to\infty}\:\sqrt[3]{\frac{8+x^2}{x\left(x+1\right)}}$

$\int\left(\frac{y\left(1+x^2\right)^{-1}}{\left(1-y^4\right)^{\frac{1}{2}}}\right)dx$

$\left(x^{2\:}+1\right)\frac{dy}{dx}=x\:-4xy$

$3\left(x-3\right)^3$

$\int\frac{e^{9x}}{9}dx$

$\cos\left(x\right)=055$