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If $A = 35^{0}, B = 15^{0} and C = 40^{0}$ then $\tan A \tan B + \tan B \tan C + \tan C \tan A =$

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Correct option is C

If A+B+C=90∘, thentanAtanB+tanBtanC+tanCtanA=1

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If A=350 , B=150 and C=400 then tanAtanB+tanBtanC+tanCtanA=

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If $A = 35^{0}, B = 15^{0} and C = 40^{0}$ then $\tan A \tan B + \tan B \tan C + \tan C \tan A =$