Help Please regarding the law of cos.

asked May 10, 2019 30.0k views

3 votes

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The equation can be solved for 2abcosC
a²+b²-c² = 2abcosC
4²+3²-2² = 2abcosC
16 + 9 - 4 = 2abcosC
25 - 4 = 2abcosC
21 = 2abcosc

8.4k points

3 votes

a=4,
b=3,
c= 2

a² + b² -2abcosC =c²
a² + b² - c² = 2abcosC
2abcosC = 4² + 3² -2² = 16 + 9-4= 21

Answer : B.21

Mysuperass answered May 16, 2019

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