$\int-x^2\ln\left(x\right)dx$
$a^2x^2-2axby+b^2y^2$
$\lim_{x\to0}\left(\frac{\left(3^x-1\right)}{x}\right)$
$\left(a+b\right)^2-\left(a-b\right)^2=20$
$-5+10\left(-3\right)$
$-25+\left(-30\right)+97-45-\left(-102\right)$
$cos4x=2cos^2\left(2x\right)-1$
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