MATHEMATICS FOR IIT-JEE
13. Equation of the pair of tangents from a point to a parabola
Parabola equation y² = 4ax; point from which tangents are drawn is (x1,y1)
Equation is SS' = T²
S = y² = 4ax
S' = y1² = 4ax1
T = yy1 - 2a(x+x1)
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