Find the principal values of `cos^(-1)(sqrt(3))/2` and `cos^(-1)(-1/2)`
Find the principal values of `cos^(-1)(sqrt(3))/2` and `cos^(-1)(-1/2)`
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`cos^(-1)(-(1)/(2))=pi-cos^(-1)((1)/(2))=pi-cos^(-1)(cos""(pi)/(3))=pi-(pi)/(3)=(2pi)/(3)`
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