Aalexis0629 Aalexis0629
  • 12-07-2020
  • Mathematics
contestada

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

Respuesta :

ujalakhan18
ujalakhan18 ujalakhan18
  • 12-07-2020

Answer:

[tex]2abCosC = 1[/tex]

Step-by-step explanation:

The cosine rule is

=> [tex]a^2= b^2+c^2-2abCosC[/tex]

For 2abCosC, it becomes

=> [tex]2abCosC = b^2+c^2-a^2[/tex]

=> [tex]2abCosC = (2)^2+(1)^2-(2)^2[/tex]

=> [tex]2abCosC = 1[/tex]

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