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If length of perpendicular from origin to line x/a + y/b = 1 is p, then prove that 1/p^2 = 1/a^2 + 1/b^2

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If length of perpendicular from origin to line x/a + y/b = 1 is p, then prove that 1/p2 = 1/a2 + 1/b2

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Equation of line cut intercepts a and b at axis
x/a + y/b = 1 …(i)

Length of perpendicular drawn from origin (0, 0) to line

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