$\frac{1}{1-\sqrt{3}}+\frac{1}{1+\sqrt{3}}$

$\frac{\sin\left(a\right)\cos\left(a\right)}{\cos\left(a\right)\left(\sin\left(a\right)-\sin\left(a\right)\cos\left(a\right)\right)}$

$x^2=24\sqrt{5}$

$\left(4a^3b^2-6a^3b\right)^3$

$5x^2+10x-15$

$2m\left(2m-4n\right)-2\left(4m-4n\right)$

$x^2=-16y$