Question

if cos theta 1=2 cos theta 2 then find the value of tan theta1- theta2/2tan theta1+theta2/2​

Answer 1

Answer:

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Answer 2

Answer:

cosθ1=2cosθ2

cosθ2cosθ1=2

Applying componendo and dividendo, we get

cosθ1−cosθ2cosθ1+cosθ2=2−12+1

⇒−2sin(2θ1+θ2)sin(2θ1−θ2)2cos(2θ1+θ2)cos(2θ1−θ2)=3

⇒tan(2θ1+θ2