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Mathematics 9 Online
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) ?

OpenStudy (anonymous):

so does this equal arccos(0.86) =0.86 ?

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