$2\4x^2\:-\:1\2y^2\:y\:-2\5xy\:+\:1\6y^2\:y\:1\10xy\:+\:1\3y^2$

$2\left[5+3\left(5-6+4\right)-1\right]$

$\left(4x^2\:-\:6y^2\right)^2$

$3\frac{dy}{dx}+y=3e^xy^4$

$y'=x\left(1-x\right)\left(x-2\right)$

$\frac{\left(a+b\right)^2+\left(a-b\right)^2}{a^2+b^2}$

$\sqrt{16x^3}$