Show that the equation of the straight l...

Show that the equation of the straight line meeting the circle `x^2 + y^2 = a^2` in two points at equal distance `d` from `(x_1, y_1)` on the curve is `x x_1 + yy_1 - a^2 + 1/2 d^2 = 0`. Deduce the equaiton of the tangent at `(x_1, y_1)`.

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