leonardoisaula1 leonardoisaula1
  • 12-12-2019
  • Mathematics
contestada

Which expression is equivalent to cos 120°?

Respuesta :

altavistard
altavistard altavistard
  • 16-12-2019

Answer:

cos 120° = -1/2

Step-by-step explanation:

cos 120° =  (adjacent side) / (hypotenuse.

Here the adjacent side (the side next to the central angle in this 30-60-90 triangle) is -1.  Then the hypotenuse is 2 and the opposite side is √3.

Thus, cos 120° = -1/2

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