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proof of cotAcotB+cotBcotC+cotCcotA=1

deepa , 11 Years ago
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anser 1 Answers
Sher Mohammad

Last Activity: 11 Years ago

A + B = 180-C


take tan of both sides

(tan A + tan B)/(1-tan A tan B) = - tan C

or tan A + tan B + tan C = tan A tan B tan C

divide both sides Tan A tan B tan C

1/tan B 1/ tan C + 1/tan A 1/ tan C + 1/ tan A 1/tan B = 1

cot B cot C+ cot A cot C + cot A cot B = 1

sher mohammad
b.tech, iit delhi

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