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Math Level 2 Preparation for SAT

Shared from SAT Subject (Mathematics) - 9 on Sep 24, 2018 1:29 PM

If A + B + C = 180, then the value of (cot B + cot C) (cot C + cot A + cot B) is

sec A sec B sec C
cosec A cosec B cosec C
tan A tan B tan C
cot A cot B cot C


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It seems to be wrong ..put angle 60 degree.....please provide the answer explanation