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cosA + cosB – cosA+B = 3/2 show that A=B=60 degrees

cosA + cosB – cosA+B = 3/2 show that A=B=60 degrees

Grade:11

2 Answers

Yash Baheti IIT Roorkee
askIITians Faculty 97 Points
9 years ago
Hi,

Write a+b as pi-c. As they are angles of a triangle.
Put the value and simplify. You will get CosA+CosB+CosC= 3/2.
This is possible only when each of them is ½ of every angle is 60 degrees.

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Yash Baheti IIT Roorkee
askIITians Faculty 97 Points
9 years ago

Hi,

Write a+b as pi-c. As they are angles of a triangle. Put the value and simplify. You will get CosA+CosB+CosC= 3/2. This is possible only when each of them is ½ of every angle is 60 degrees. ….….….….….….….….….….….….….….….….….….….….….….….…...

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