$-2x^2\left(-5x^2+2x\right)$
$\left(2a-5b+7c\right)^2$
$sin^{\left(2\right)}x\left(cot^{\left(2\right)}x+1\right)=1$
$\left(3m+2n+x\right)^2$
$80\cdot70$
$5.y-38=3.39$
$\sqrt{25\cdot\:64}$
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