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

$3x^2-60x+32,8=0$

$\left(3x+2y\right)-\left(5x^2-4y^2\right)$

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

$-\frac{1}{2}+3-5+\frac{3}{2}$

$\int\left(5x^2+7\right)^2dx$

$\int\frac{\sqrt{4-x^{2}}}{x}dx$