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[" (20) "cos(2cos^(-1)x+sin^(-1)x)," whe...

[" (20) "cos(2cos^(-1)x+sin^(-1)x)," when "x=(1)/(5)" where,"0leqslant cos^(-1)x leqslant pi],[-(pi)/(2)leqslant sin^(-1)x leqslant(pi)/(2)]

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