2 years ago

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

Mathematics

1 answer:

mel-nik [20]2 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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