if in a triangle ABC angle B = 120° then cosA + cosC lie in?
Gudul , 8 Years ago
Grade 11
Trigonometry> if in a triangle ABC angle B = 120° then ...
1 Answers
Khimraj
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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