![How do you evaluate cos^-1[cos(-pi/2)]? | Socratic](https://useruploads.socratic.org/Uy8LuL9zR2GDEo8cnUPq_30656204_1656126397756357_2131343757902086144_n.jpg "How do you evaluate cos^-1[cos(-pi/2)]? | Socratic")
How do you evaluate cos^-1[cos(-pi/2)]? | Socratic
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