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if in a triangle ABC angle B = 120° then cosA + cosC lie in?

if in a triangle ABC angle B = 120° then cosA + cosC lie in?

Grade:11

1 Answers

Khimraj
3007 Points
7 years ago
As A+ C = 60°. So cosA +cosB = cosA + cos(60°-A) so find its max and Min value by Maxima and minima as there is lot of problem in typing these steps. And u get is value in range [3/2,√3].Hope it clears. If still u have doubts then please clarify. If u like answer then please approve the answer.

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