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00:00 - 00:59 | the question we have is mutually perpendicular tangents PA and PB are drawn to y square is equal to 4 x then the app to find out the minimum length of Ab so what I have done is have made a rough diagram here of a parabola where the equation is y square is equal to 4 x so we have a parabola care as we have the to access the y axis and x axis with chord of the contact that's the property which I'm going to right here which is the chord of contact of mutually per |

01:00 - 01:59 | cooler tangent is always call basically the meaning of this is the parabola which have Drawn The vocal cord which is the maximum the maximum distance let me just dry the maximum distance will be for a as the question has already given us which is for a we are the focal which is the a therefore the minimum the minimum length of a b minimum length of a b is |

02:00 - 02:59 | ok thank you |