$\frac{1-\cos^2\left(x\right)}{1+\cos^2\left(x\right)}$
$9y^2-21y-8$
$\frac{2}{m^{2}}=\frac{1}{n}$
$x^2+y^2=x$
$\frac{1}{4}-\frac{1}{4}\cos\left(2x\right)=\frac{1}{8}\sin\left(x\right)^2$
$4\sqrt{12}+6\sqrt{48}$
$\frac{x^4-4x^3+4x^2+2}{x^2-x}$
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