$15\cdot22\cdot2$
$\frac{61+69}{2}$
$20+90+51ng$
$\left(a^3+8\right)\left(a^3+9\right)$
$16u^2+40uy+25y^2$
$\frac{\sin\left(a\right)}{1-\cos\left(a\right)}=\csc\left(a\right)+\cot\left(a\right)$
$\int ( 3 x - 5 ) ^ { 3 } 3 d x$
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