$\frac{\cot\left(x\right)\sin\left(x\right)}{\csc\left(x\right)\cos\left(x\right)}$
$\left(3x^2-2y\right)\left(3x-2y\right)$
$\left(2x+3\right)\left(4x^2+6x+9\right)$
$-0.6+\frac{1}{4}$
$5x^2+7y^2=28$
$1-tan^2\left(x\right)=0$
$3x+2\left(4x-4\right)$
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