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Snowcat [4.5K]
4 years ago
8

A=2 b=2 c=1 Find the value of 2abcosC

Mathematics
1 answer:
mel-nik [20]4 years ago
6 0

Answer:

2abCosC = 1

Step-by-step explanation:

The cosine rule is

=> a^2= b^2+c^2-2abCosC

For 2abCosC, it becomes

=> 2abCosC = b^2+c^2-a^2

=> 2abCosC = (2)^2+(1)^2-(2)^2

=> 2abCosC = 1

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