$\frac{b^2-9b-x}{b^2}$
$4sinx+4=6$
$\int e^x\sqrt{13+e^x}dx$
$\left(y_{2}-3.6\right)\left(y_{2}+4.7\right)$
$\sqrt{49a^9b^{10}c^8}$
$x ^ { 4 } - x ^ { 3 } - 3 x ^ { 2 } + 3 x$
$\int\left(y^2\right)\sqrt{9-4y^2}dy$
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