$\left(10x^2+7x^2\right)\left(10x^2-7x^2\right)$
$x\left(4x^2+7\right)$
$36x^2-18xy+4y^8$
$y-2\cdot1=4$
$9n^2:6n$
$\int_{-2}^{-1}\frac{\left(3x-2\right)}{x^2+4x+5}dx$
$\cos\left(x\right)\left(\csc\left(x\right)-\sqrt{2}\right)=0$
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