$21ap^2q^2-35bp^2q^2$
$\cos c^2x=2$
$\lim_{t\to0}\left(\frac{ln\left(x\right)}{x^2}\right)$
$6\cdot3+6\cdot2$
$-0.14r+r-0.78$
$x^2+xy-12\:;\:\:\:x=3\:y=-1$
$=\frac{1}{-2x^2-6x-4}$
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