$\frac{f^2-f}{f+1}$
$y^2=\:e^2x$
$\frac{\left(x^2-4\right)}{\left(x^2+2\right)}$
$\frac{\left(-15x^5+3x^4-8x^3+2x^2-3x+7x\right)}{3x^2+x}$
$-\left(\cos^2x-\sin^2x\right)$
$x^2y^2-2x=3$
$\left(0.2-2x\right)^2$
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