$\frac{x^6-8y^6}{x^2-2y^2}$

$\frac{sin^4\theta\:+\sin\:^2\theta\:\cdot\:\cos\:^2\theta\:}{1+\cos\:\left(\theta\:\right)}=1-\cos\:\left(\theta\:\right)$

$\sin^4\left(x\right)-\cos^4\left(x\right)=2\cos\left(2x\right)$

$x^2+x-6>0$

$\left|-25+\left(-7\right)\right|$

$\frac{-4x-4}{2x+1}$

$45.75=4.25$