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If A+B+C=pi, prove that (tanA)/(tanBd...

If `A+B+C=pi,` prove that `(tanA)/(tanBdottanC)+(tanB)/(tanAdott a n C)+(tanC)/(tanAdottanB)=tanA+tanB+tanC-2cot A-2cot B-2cot C`

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CENGAGE PUBLICATION-TRIGONOMETRIC FUNCTIONS-All Questions
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