3 years ago

Which expression is equivalent to cos 120°?

Mathematics

1 answer:

ryzh [129]3 years ago

4 0

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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