Question

If 2tan alpha/2=tan beta/2 PROVE THAT COS ALPHA =3+5COS BETA/5+3COS BETA

Answer 1

We will learn step-by-step the proof of tangent formula tan (α - β). Prove that: ... Proof: tan (α - β) = sin (α - β)/cos (α - β) ... If tan β = sinαcosα 2+cos2α prove that 3 tan (α - β) = 2 ..