$\left(x^3\:-\:5y^4\right)\:\left(x^3\:+\:5y^4\right)$
$2\sin\left(\frac{x}{2}\right)+2\cos\left(x\right)=0$
$100xy^2-125x^3+200$
$x^2-2x-63=0$
$2+\frac{1}{6}a=-4$
$6y-y$
$\frac{\left(3x-2\right)}{\left(2x+12\right)}$
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