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38. If the normal to a parabola y²=4ax at P meets the curve again in Q and if PQ and the normal at Q makes angles alpha and beta respectively with the x-axis than {tan alpha(tan alpha +tan beta)} has the value equal to

Answer» 38. If the normal to a parabola y²=4ax at P meets the curve again in Q and if PQ and the normal at Q makes angles alpha and beta respectively with the x-axis than {tan alpha(tan alpha +tan beta)} has the value equal to


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