Question

M is the cetre of circle , A is an exterior point of circle . the line passing through A is the secant of circle which intersect the circle inpoint C and D and passes through point M. Line AB is a tangent at B.
prove that:
${ab}^{2} - {ac}^{2} = 2ac \times cm$
NOTE: THE EQUATION VARIABLE GIVEN IS IN CAPITAL LETTERS
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Answer 1

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