$-\tan\left(-x\right)\cot\left(-x\right)$

$\sqrt[3]{\sqrt{\left(64a^6\right)}}$

$\lim_{x\to\infty}\left(\frac{\ln\left(x^2+4\right)}{\ln\left(x-1\right)}\right)$

$\int_{-\frac{1}{2}}^{\frac{1}{2}}\frac{4x^2+5x+7}{4x^2+4x+5}dx$

$x^2-4x+5$

$\left(5x^4+x^3-2x^2-5\right)-\:\left(7x^4-5x^2+3x+4\right)$

$\sqrt{\frac{a^2}{mn^2}+\frac{a^2}{m^2n}}$