tan 2B = tan ( (A + B) - (A -B) ) = ( tan ( A+ B ) - tan (A - B)) / 1 +tan ( A+ B ) tan (A - B) = (m - n) / 1 + mn
If mn=tan Atan B, find the value of m+nm−n is
If sin A = n sin B, then n−1n+1 tan A+B2 =