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[" 8.If "A+B+C=180^(@)" ,then "(cot A+co...

[" 8.If "A+B+C=180^(@)" ,then "(cot A+cot B+cot C)/(cot A cot B cot C)" is equal "],[" to "],[[" a."1," b."cot A cos B cot C],[" c."-1," d."0]]

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