$4x^2-2y^2$
$\frac{1a}{2}+2a-\frac{1b}{6}$
$8-\left(13\cdot7\right)$
$a-a+4a-1$
$\frac{-3x^4+4x^3-6x^2-5}{x^2-2x+4}$
$2=tan^2x-1$
$\frac{1}{2}x\:2a\:-\:6b+\:8\:$
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