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OpenStudy (en):
please help! prove that! arccos (-x)= π-arccos x
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OpenStudy (en):
please help :)
OpenStudy (beginnersmind):
Remember the definition of arccos x. It's the _angle_ whose cosine is x. So this identity says that two angles, one of whose cosine is x, and another whose cosine is (-x) add up to pi (that is 180 degrees).
OpenStudy (beginnersmind):
A figure of the unit circle might illustrate it better: |dw:1441508969839:dw|
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