Question

cosA/1 + SinA = tan(45+A/2) prove it....questions no 11

Answer 1

expand LHS by using tan(a+b) then simplify expression using half angle formula

Answer 2

Use the RHS as a hint how to proceed. sinA = 2sin(A/2)cos(A/2)cosA = 2cos^2 (A/2) - 1 sinA / (1+cosA) = sin(A/2) / cos(A/2) = tan(A/2) ...