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Lena [83]
4 years ago
11

Evaluate the following expression exactly: cosine of 120°

tle="cos(120)" alt="cos(120)" align="absmiddle" class="latex-formula">
​
Mathematics
2 answers:
Maslowich4 years ago
8 0

Answer:

cos120° = - \frac{1}{2}

Step-by-step explanation:

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

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


scoray [572]4 years ago
3 0

Answer:

cos(120°) =  -1/2° or 0.5°

Step-by-step explanation:


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