$4x^2-10y=-10$

$x^2+y^2-2x-2y+50=20$

$1+\frac{1}{2}\left(4x-6\right)=-2$

$\lim_{x\to0}\left(\frac{x^3-x^2+x-1}{x^3-x^2}\right)$

$2\cos^2\left(x\right)=\sqrt{3}\cos\left(x\right)$

$\left(2+\sqrt{y}\right)+\left(2-\sqrt{y}\right)$

$\int\left(\frac{x+1}{\left(x-2\right)\left(x^2+3\right)}\right)dx$