$\left(5xy^3+4xy\right)$
$\frac{2\left(\sqrt{x}\right)-2\left(\sqrt{x+by}\right)}{\sqrt{x+by}\left(\sqrt{x}\right)}$
$\sqrt{a^2b}.\:\sqrt[3]{a^2b^4}.\:\sqrt[5]{ab^4}$
$\frac{cos\theta\:}{1+sin\theta\:}-\frac{1}{cos\theta\:}=-tan\theta\:$
$7=c+d-6$
$-5bc-bc$
$\left(a^x+b^{y+11}\right)^2$
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