$\lim_{x\to0}\left(\frac{10\cdot sin\left(x\right)}{x^2}\right)$

$\frac{3x+5}{x}+\frac{7}{x-3}$

$\frac{d}{dx}4x^3+lny^2+2y=2$

$\int\frac{2x^2+1}{x^2+5x+6}dx$

$\left(2x+6y\right)dx+\left(6x-2y\right)dy=0$

$47-\left(-15\right)$

$1+\left(8-1-5\right)-\left(3-10\right)$