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Mathematics 16 Online
OpenStudy (anonymous):

A and B are two fixed points. The vertex C of ABC moves such that cot A + cot B = cnstant. The locus of C is a straight line: (a) perpendicular to AB (b) parallel to AB (c) inclined at an angle (A - B) to AB. (d) none of these

OpenStudy (anonymous):

pl. help

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