$\frac{8c}{ab^2-\sqrt{c}}$
$\sec^2\left(x\right)-\cot\left(x\right)^2=1$
$3x^2-60x$
$-4x^2-47x-70$
$\left(0.5x-0.7y\right)^2$
$25x^2-80x$
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