$\cos\left(\pi-\cot\left(-2\right)\right)$
$( 2 a + 3 b ^ { 2 } ) ^ { 2 }$
$x^6y^2-9$
$\frac{12a^6}{3a^3}$
$\frac{sin\:\left(a+b\right)}{sin\left(a\right)cos\left(b\right)}$
$4x-8=0$
$\frac{145}{-5}$
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