$\:\:\:\sqrt{x}3\:.\:\sqrt{x}4\:$
$\frac{sin\left(x+y\right)-sinycosx}{cosy}$
$\left(3x^2+4y^7\right)^2$
$\left(2m+1\right)\cdot\left(2m-1\right)$
$\frac{25-36x^2}{5-6x}$
$9x^2-12x-45=0$
$\int x^4\sqrt{3x+7}dx$
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