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[" 16.If "A+B+C=pi" and "cos1=cos B cos ...

[" 16.If "A+B+C=pi" and "cos1=cos B cos C],[" then the value of "tan A" in terms of "B" and "C],[" is "],[[" (1) "tan B tan C," 2) "tan B+tan C],[" 3) "tan B-tan C," 4) "tan C-tan B]]

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