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How do you calculate Arccos on a calculator? Function. Press the “2nd” and then the “sin” buttons to calculate arcsin. The “sin-1” button will appear as a result of this. Enter the value you want to
arccos ( x) = cos -1 ( x) For example, If the cosine of 60° is 0.5: cos (60°) = 0.5. Then the arccos of 0.5 is 60°: arccos (0.5) = cos -1 (0.5) = 60°.
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x = arccos() Cosine is negative in quadrants II and III, so there are two solutions: x= and x=. These are the only two angles within 0≤x<2π whose cosine value is equal to . 2. 6cos 2 (x) + 9cos(x) -
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