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y^2=4x=2px p=2. 焦點座標(1,0). 傾斜角是60度,則斜率k=tan60=根號3 那麼直線方程是:y=根號3*(x-1) 即根號3x-y-根號3=0. 頂點到直線的距離d=|-根號3|/根號(3+1)=根號3/2.
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