$-\left(-2c^2d^3v^7\right)^3$

$\frac{d}{dx}\frac{2+x^2}{x+5}\:$

$7mn-65mn$

$\frac{2zx^3}{6x^2vy}$

$30c+45$

$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)\sqrt[2]{\cos\left(2x\right)}}{x^2}\right)$

$\sqrt[2]{\left(3^2+3\right):\left(-3\right)-2^2.\left(-5\right)}-\left(-6+2^3\right).\left(-6+2^3\right).\left(-5\right)^2-7$