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[" (a) "0],[" If in a "Delta ABC,tan A+t...

[" (a) "0],[" If in a "Delta ABC,tan A+tan B+tan C=6" ,then "cot A cot B cot C=],[[" (a) "6," (b) "1," (c) "1/6]],[" ,"1-2A-tan2A-tan A" is equal to "]

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