The law of cosine is c2 = a2 + b2 – 2ab cos C. find the value of 2ab cos C

asked Oct 9, 2018 123k views

1 vote

by Punam

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4 votes

add 2ab cos C to both sides of the '=':-

c2 + 2ab cos C = a2 + b2

now subtract c2 from both sides:-

2ab cos C = a2 + b2 - c2

Gaohomway answered Oct 11, 2018

8.7k points

7 votes

Answer: 37

Explanation:

Qollin answered Oct 15, 2018

8.0k points

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