$\frac{3x^2-5x}{2}$
$6x^2+7x=3$
$cot^2\left(x\right)+\frac{1}{sec\left(x\right)cos\left(x\right)}$
$\frac{dy}{dx}=\frac{y\:-\:x}{y\:+x}$
$\frac{2x+2a}{x+a}$
$1.25\cdot\frac{6}{18}$
$-\left(1-2x\right)^2$
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