$m\:2\:-14m+49=\:81$

$\left(\frac{m^x}{m^y}\right)^2.\left(\frac{m^y}{m^z}\right)^z.\left(\frac{m^z}{m^x}\right)^y$

$\sqrt{3}sen\left(2x\right)-2cos^2\left(x\right)+3$

$\left(x^2z\right)\left(3x^2y^3+z^4\right)$

$\frac{v^m}{v^n}$

$\frac{27m^3+125n^3}{32m-5n}$

$\left(-1\right)\cdot\left(-1\right)\cdot\left(-1\right)\cdot\left(1\right)\cdot\left(-1\right)\cdot\left(-1\right)\cdot\left(-1\right)$