$2.\left\{-8\right\}-3.\left\{-7\right\}-4.\left\{+3\right\}$

$\lim\:_{x\to\:4}\left(\frac{x^2+2x-8}{x^2-16}\right)$

$\int\left(x^4.sin\left(2x^5+1\right)\right)dx$

$\left(x^2+2x\right)\ln\left(x\right)$

$\left(15m+6\right).\left(15m-6\right)$

$\frac{d}{dx}\left(x\cdot cos\left(x\right)^{ln\left(x\right)}\right)$

$-6.50+3.75$