$8^3-3-2$

$x^2-13x+140=0$

$\frac{d}{dx}\left(5x^2y^2-2x-3=0\right)$

$\frac{d}{dx}\left(3x^3y+2xy^2+5y=3x^4\right)$

$sin\left(90+x\right)+sin\left(90-x\right)$

$\frac{dy}{dx}\left(y=\frac{\left(2x^2+3\right)^2}{\left(x+1\right)^2\left(5x+6\right)}\right)$