$k-1\cdot3k+3$
$\int\left(x^2+1\right)ln\left(x\right)dx$
$15-3x<21$
$\left(-18\right)-\left(-35\right)\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\frac{4-8}{5-5}$
$8v^2-48+72$
$\int_{\sqrt{2}}^2\left(\frac{\sqrt{2x^2-4}}{x}\right)dx$
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