The circles x^2 + y^2 + 2g1x- a^2=0 and ...

The circles `x^2 + y^2 + 2g_1x- a^2=0 and x^2 + y^2 + 2g_2x-a^2 = 0` cut each other orthogonally. If `p_1 and p_2` are perpendicular from `(0,a) and (0,-a)` on a common tangent of these circles , then` p_1p_2` is equal to

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The circles `x^2 + y^2 + 2g_1x- a^2=0 and x^2 + y^2 + 2g_2x-a^2 = 0` cut each other orthogonally. If `p_1 and p_2` are perpendicular from `(0,a) and (0,-a)` on a common tangent of these circles , then` p_1p_2` is equal to

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