$\frac{216-125y^3}{6+5y}$
$\frac{di}{dt}=ai-\frac{b}{n}i^2$
$\frac { ( 1 - x ) ^ { 3 } } { x ^ { 3 } }$
$\left(2b^4+2c^3\right)\left(2b^4-2c^3\right)$
$\sec\left(x\right)^2\cdot\cot^2\left(x\right)\cdot\tan\left(x\right)$
$49x^2+14x+1=0$
$-5\cdot\left(-18\right)$
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