1.

IfA+ B+C= pi//2 , " then " tan 2A + tan 2B+ tan 2C=

Answer»

SIN2A SIN2B SIN 2C
Cot2A Cot2B Cot2C
Cos2A COS2B Cos2C
Tan2A Tan2B Tan2C

Answer :D


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