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[" (2) If "x=a cos nt-b sin nt" ,then "(...

[" (2) If "x=a cos nt-b sin nt" ,then "(d^(2)x)/(dt^(2))" is "],[[" (a) "n^(2)x," (b) "-n^(2)x," (c) "nx," (d) "-nx]]

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