$\begin{array}{1 1}(A)\;\sin ^{-1} \bigg(\sqrt {\large\frac{84}{85}}\bigg) \\(B)\; \cos^{-1}\large\frac{1}{\sqrt{85}} \\(C)\;\cos ^{-1} \bigg(\sqrt {\large\frac{85}{84}}\bigg) \\(D)\; \sin^{-1}\large\frac{4}{\sqrt{30}} \end{array} $

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