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Equation of Chord of Contact to Parabola

Equation of chord of contact OQ with respect to the point P (h, k) is ky = 2a(x + h) or ky – 2a(x + h) = 0 or T = 0.
Equation chord whose midpoint is (x1, y1)
yy1 – 2a (x + x1) = y12 – 4ax1 or T = S1
where T = yy1 – 2a(x + x1) and S1 = y12 – 4ax1.

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