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Evaluate "cos"(2"cos"^(-1)x+"sin"^(-1)x)...

Evaluate `"cos"(2"cos"^(-1)x+"sin"^(-1)x)` at `x=1/(5)`, where `0le"cos"^(-1)xlepiand-pi/(2)le"sin"^(-1)xlepi/(2)`.

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