$\frac{d}{dx}\left(-3x^2+y^2+144x-32y-1481=0\right)$

$\lim_{x\to\infty}\left(9x\left(e^{\frac{2}{x}}-1\right)\right)$

$\int_1^3x\left(e^{1-x^2}\right)dx$

$\left(\frac{2}{5y}\right)^4$

$\left(2x^2\right)\left(-10x^{-3}\right)$

$\frac{dy}{dx}=39yx^{12}$

$\cos\left(1+\tan^2x\right)=\sec\left(x\right)$