$\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}}\left(3cos^3\left(x\right)\right)dx$

$\left(a-by\right)^4$

$c^2d^2+c^2d^2-c^2j^2-e^2j^2$

$\frac{cos^2\left(x\right)}{8sin\left(x\right)\cdot\:\frac{sin\left(x\right)}{cos\left(x\right)}}$

$\frac{4}{3}-2x<-15$

$cos\left(3x\right)=cos\:\left(x\right)\:\left(2cos2x\:-\:1\right)$

$\frac{3x^5-x^2+x-2}{3x^3-1}$