$\frac{d^2}{dx^2}\left(2xy+y^2+2x=5\right)$
$2^2+4^2-5$
$\frac{a^2+ab}{a^2-ab}$
$\ln\left(3x+2\right)=\ln\left(5x-6\right)$
$\left(2cot\left(t\right)+1\right)\left(tan\left(t\right)-1\right)=\:0$
$\left(3xy\right)\left(5x^2y^3\right)$
$13.6168-4.46\cdot2.58$
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