$\frac{sin^2\left(x\right)-cos\left(x\right)}{cos\left(x\right)sin\left(x\right)}$
$\frac{m^4n^4}{3m^4n^2}$
$\int\frac{2}{9+4x^2}dx$
$\cos2y=\frac{1-\tan^2y\:}{1+\tan^2y}$
$\left(9+4v\right)^2$
$8x^2+12x+4$
$f^2+3f-5$
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