1.

Through the vertex O of the parabola y2=4ax, two chords OP and OQ are drawn and the circles on OP and OQ as diameters intersect at R. If θ1,θ2 and ϕ are the inclinations of the tangents at P and Q on the parabola and of OR respectively, then the value of cotθ1+cotθ2 is

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Through the vertex O of the parabola y2=4ax, two chords OP and OQ are drawn and the circles on OP and OQ as diameters intersect at R. If θ1,θ2 and ϕ are the inclinations of the tangents at P and Q on the parabola and of OR respectively, then the value of cotθ1+cotθ2 is



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