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[" 7.If "tan A+tan B=p" and cot "A+cot B...

[" 7.If "tan A+tan B=p" and cot "A+cot B=q],[" then "cot(A+B)=],[[" 1) "(p-q)/(pq)," 2) "(q-p)/(pq)," 3) "(pq)/(p+q)," 4) "(pq)/(p-q)]]

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