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Verify that the function y=cosx-sinx is ...

Verify that the function `y=cosx-sinx` is a solution of the differential equation `y''+y=0.`

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Knowledge Check

  • A solution of the differential equation y'=y is

    A
    `y=e^(x)`
    B
    `y=e^(x)`
    C
    `y=x`
    D
    `y=x^(2)`

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