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OpenStudy (anonymous):
Use a calculator to evaluate arccos(0.86) to 2 decimals in radians. Do I enter this as cos-1(0.86) into the calculator? to equal 0.54 OR is this like sin-1(0.5) = (0.5) ?
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OpenStudy (anonymous):
so does this equal arccos(0.86) =0.86 ?
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