How do you use a calculator to evaluate ${cos}^{- 1} (- 0.8)$ $cos^-1 (-0.8)$ in both radians and degree?

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Answer 1 · 2016-12-26T06:33:33

Calculate ${cos}^{- 1} (- 0.8)$ $cos^-1 (-0.8)$ in both Radians and Degrees by changing modes in your calculator and repeating the calculation.

Change modes by pressing "setup" on the calculator, then press "angle unit" and change to your desired mode.

How do you use a calculator to evaluate cos−1(−0.8)cos^-1 (-0.8) in both radians and degree?