$\left(-26\right).\left(-6\right)$
$60^2-61^2$
$\int\left(4+x^2\right)^{-7}dx$
$x^{\left(5\right)}+\:x^{\left(4\right)}-2x^{\left(3\right)}-2x^{\left(2\right)}+x+1$
$4-\ln\left(x\right)=1$
$2st^4-8st^2-90s$
$11-\left(-4\right)\cdot\left(-9\right)$
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