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cos^(-1)(-1/4)=pi+tan^(-1)(-sqrt(15))...

`cos^(-1)(-1/4)=pi+tan^(-1)(-sqrt(15))`

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cos^(-1)(1/4)=sin^(-1)sqrt(1-1/16)=sin^(-1)((sqrt(15))/4) =tan^(-1)(sqrt(15))

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