The equation of a projectile is \( y=a x-b x^{2} \). Its \( \mathrm...

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The equation of a projectile is \( y=a x-b x^{2} \). Its
\( \mathrm{P} \)
horizontal range is
W.
(1) \( \frac{a}{b} \)
(2) \( \frac{b}{a} \)
(3) \( a+b \)
(4) \( b-a \)
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