$\frac{\left(4x^2+ax+a-4\right)}{x^2-x-2}$

$x^2+2=10$

$\sqrt[6]{729x^3}$

$x\sqrt{2x^2}$

$3cos^2\left(x\right)-sin^2\left(x\right)=4cos^2\left(x\right)-1$

$\left(3y-\frac{1}{4}\right)^2$

$\frac{2}{\left(1+\cos\left(x\right)\right)\cdot\sin\left(x\right)}=\frac{2}{\sin\left(x\right)}$