Question

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Answer 1

Answer:

_1/3

Step-by-step explanation:

given that ; costheta1 = 2 cos theta 2

= cos theta 1/ cos theta 2 = 2

= (cos theta 1 + cos theta 2)/ (cos theta 1- cos theta 2) = 3/1

= (2 cos theta 1 cos theta 2)/ ( -2 sin theta 1 . sin theta 2) =3/1

= cot (theta 1 + theta 2) /2 . cot ( theta 1 - theta 2) /2 = - 3

= tan ( theta 1 + theta 2) /2 . tan ( theta 1 - theta 2)/2 = -1/3