From the equation y = cos ax, find the 1st four derivatives of y with respect to x

first 4 derivatives
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y=cos(ax)

y'=-asin(ax)

y"=-a²cos(ax) (=-a²y) (basis of simple harmonic motion)

y"'=a³sin(ax)

y""=a⁴cos(ax) (=a⁴y)

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