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If , prove that .
If $\tan^{-1}a + \tan^{-1}b + \tan^{-1}c = \pi$, prove that $a + b + c = abc$.
Given: $\tan^{-1}a + \tan^{-1}b + \tan^{-1}c = \pi$
To show: $a + b + c = abc$
Answer
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From ISC 2018 Mathematics Paper 1, question 3.