AB, CD and PQ are perpendiculars to BD. AB=x, CD=y and PQ=z. Prove that 1/x + 1/y = 1/z

10th class mathematics. Mathematics, ncert, SSC, telangana board mathematics, andhra board mathematics, state syllabus, real numbers, logarithms, sets, polynomials, parabola, linear equations in two variables, quadratic equations, quadratic formula, progressions, coordinate geometry, similar triangles, triangles, tangents and secants, mensuration, surface areas and volumes, trigonometry, applications of trigonometry, heights and distances, probability, statistics.
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[@nithus1893]

Which book question sir?

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Its in ncert as well as telangana text book

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