caycay17
caycay17
25-06-2018
Mathematics
contestada
Help Please regarding the law of cos.
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
Answer Link
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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