Answers

2015-07-29T19:41:56+05:30
Tan(3theta)=tan(theta+2theta)=tan2theta+tantheta/1-tanthetaxtan2theta
multiply the denominator of rhs with lhs.
substitute what is in the question.
you will get tantheta+tan2theta=0
hence, tan3theta=0
so, 3theta=0,pie,2pie,.. or give the principal value.
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