$\lim_{x\to0}\left(\frac{x+1}{x}-\frac{2}{\sin\left(x\right)}\right)$

$\frac{x^{18}-y^{12}}{x^3-y^2}$

$2\sin\left(x\right)^2+5\sin\left(x\right)+3=0$

$\int\frac{70x^{2}-2x-6}{x^{3}-x^{2}-2x}dx$

$-3x\left(6\right)$

$-\frac{\left(2x\right)}{\left(1+x^2\right)^2}$

$\left(3y+4z\right)^3$