$k^2-12k+26$
$e^{2x-1}=5$
$-5x-y;\:x=3;\:y=6$
$\left(x+1\right)\cdot\left(-4\right)$
$\frac{\left(\sin\left(x\right)\sin\left(2x\right)\right)}{\left(1-\cos\left(x\right)\right)}$
$y=\ln\sqrt{x+4}$
$\left(3m+11n\right)\left(3m-11n\right)$
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