$4\frac{x^3-3x^2+2x+4}{x-7}$

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

$m\:=\:sen120^{\circ}\:cos150^{\circ}tan135^{\circ}$

$1.-2+-3\cdot5$

$\frac{4}{1}\cdot\frac{1}{8}\sqrt{12\cdot2\cdot3^2}$

$\csc^2\left(x\right)\cos\left(x\right)=2\csc^2\left(x\right)$

$\frac{dy}{dx}=5+\sqrt{y-5x+8}$