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OpenStudy (anonymous):
cos(Cos^-1(5/8)) in radians? I got 5/8, can someone please confirm my answer?
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OpenStudy (anonymous):
Correct. To be more general, always check the domain for acos (arccos, cos^-1). In this case 5/8 is in the domain so the cos(acos(5/8)) simply cancel to give 5/8.
OpenStudy (anonymous):
Thanks man!
OpenStudy (anonymous):
They may throw you a screwball and say cos(cos^-1(2)), in which case you would have to say that this is not solve-able since 2 is outside of the domain of cos^-1
OpenStudy (anonymous):
Ok, thanks for the tip
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