Question

if cosA=cosa-cosb/1-cosacosb then show that tanA/2 =tana/2cota/2​

Answer 1

Answer:

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Answer 2

Answer:

(cosA-cosB+1-cosAcosB)/(cosA- cosB-1+c... factorising numerator and denominator of RHS [(-1)/tan^2(x/2)]= [{(1+cosA)( ...