$\left(y-9\right)dx+x^2dy=0$
$\left(5m+7n\right)^2$
$\frac{2x^4-7x^3+7x^2-13}{x-2}$
$2x\cdot38$
$15m^4n-25m^3n^2-30m^2n$
$=sin^2x-3\left(1-sin^2x\right)$
$\left(2x-6d\right)\left(2x+6d\right)$
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