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[" If "tan A+tan B=a" And "cot A+cot B=b...

[" If "tan A+tan B=a" And "cot A+cot B=b" ,then the value of "cot(A+B)" is: "],[[" (a) "(1)/(-)+(1)/(-+1)+1," 1"-(1)/(-)," (c) "a+b]]

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