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[" If "4sin^(4)x+cos^(4)x=1," then "x=],...

[" If "4sin^(4)x+cos^(4)x=1," then "x=],[[" (a) "n pi," (b) "n pi+-sin^(-1)(2)/(5)],[" (c) "n pi+(pi)/(6)," (d) None of these "]]

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