sweisbeck20 sweisbeck20
  • 10-02-2019
  • Mathematics
contestada

evaluate the following expression exactly: cosine of 120°
[tex]cos(120)[/tex]
​

Respuesta :

zrh2sfo
zrh2sfo zrh2sfo
  • 10-02-2019

Answer:

cos(120°) =  -1/2° or 0.5°

Step-by-step explanation:


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jimrgrant1 jimrgrant1
  • 10-02-2019

Answer:

cos120° = - [tex]\frac{1}{2}[/tex]

Step-by-step explanation:

note that 120° is an angle in the second quadrant where cos < 0

cos120° = - cos(180 - 120)° = - cos60° = - [tex]\frac{1}{2}[/tex]


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