If p(1),p(2),p(3) be the length of per...

If `p_(1),p_(2),p_(3)` be the length of perpendiculars from the points `(m^(2),2m),(mm',m+m')` and `(m^('2),2m')` respectively on the line `xcosalpha+ysinalpha+(sin^(2)alpha)/(cosalpha)=0` then `p_(1),p_(2),p_(3)` are in:

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If `p_(1),p_(2),p_(3)` be the length of perpendiculars from the points `(m^(2),2m),(mm',m+m')` and `(m^('2),2m')` respectively on the line `xcosalpha+ysinalpha+(sin^(2)alpha)/(cosalpha)=0` then `p_(1),p_(2),p_(3)` are in:

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