caycay17
caycay17 caycay17
  • 25-06-2018
  • Mathematics
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Help Please regarding the law of cos.

Help Please regarding the law of cos class=

Respuesta :

mkryukova19 mkryukova19
  • 25-06-2018
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
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Аноним Аноним
  • 25-06-2018
The equation can be solved for 2abcosC
a²+b²-c² = 2abcosC
4²+3²-2² = 2abcosC
16 + 9 - 4 = 2abcosC
25 - 4 = 2abcosC
21 = 2abcosc
Answer Link

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