How do you evaluate #arccos (1/2)#?

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Nghi N. Share
Jun 9, 2015

Answer:

Find arccos (1/2)

Explanation:

Trig Table gives:

#cos x = 1/2 --> x = pi/3 or 60 deg#

Trig unit circle gives another arc x that has the same cos value (1/2):

x = - 60 deg, or x = 360 - 60 = 300 deg

Answers within period #(0, 2pi)#: 60 deg and 300 deg

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