$\left(\frac{5}{6}g^2a^2-\frac{2}{3}d^2\right)\left(\frac{5}{6}g^2a^2+\frac{2}{3}d^2\right)$

$\cos\left(x\right)=\sqrt{1-\left(\frac{\sqrt{5}}{4}\right)^2}$

$\frac{2}{3}x\cdot6x$

$y^2-x^2=4$

$3ab2\:+\:7ab2\:-\:4ab2\:$

$\lim_{x\to\infty}x\cdot ln\left(x+1\right)-x\cdot ln\left(x-1\right)$

$\frac{\left(cos\left(\theta\right)\right)}{1-sin\left(\theta\right)}=sec\left(\theta\right)+tan\left(\theta\right)$