$3x^2+12x-36$

$cos^2\left(x\right)+sin^2\left(x\right)\cdot\:\:sin^2\left(y\right)+sin^2\left(x\right)\cdot\:\:cos^2\left(y\right)=1$

$\frac{dn}{dw}+n=n\cdot w\cdot e^{w+2}$

$\sqrt[4]{\frac{\sin\left(x\right)\cos^2\left(x\right)}{xe^x}}$

$-\frac{3}{7}x^3x\left(\frac{2}{9}x^4-\frac{7}{6}x^3-\frac{1}{5}\right)$

$cos\left(x\right)=\frac{1-sen^2\left(x\right)}{1-cos\left(x\right)}$

$\int\frac{9x-8}{x+1}dx$