$31.42+56.8+124.78$

$\left(x^2-7x+12\right)\left(-x^2+5\right)$

$\frac{-14x^9y^8}{-7x^9y^2}$

$\tan\left(x\right)+1=\sin\left(x\right)\cdot\sec\left(x\right)+1$

$\lim_{x\to1}\left(\frac{sin^20-x}{x}\right)$

$7.55+4.24+2$

$\lim_{x\to\infty}\left(3+4x\right)^{\frac{1}{x^3}}$