$4 x ^ { 2 } - 3 x + 5 x ^ { 2 } + 2 x - 3$

$-\frac{3}{5}m+\frac{3}{5}m-\frac{1}{2}m$

$\left(3x^2+6xy-y^2\right)\cdot dx+\left(3x^2-2xy+3y^2\right)\cdot dy=0$

$\frac{1-\tan x}{\sin\left(x\right)}=\csc x-\sec x$

$\left(5x\right)^2+13\left(5x\right)+42$

$\left(2n-3^3\right)$

$\lim_{x\to-2}\left(\frac{x^2+4}{x+2}\right)$