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Determine the degree of Maclaurin polynomial required for the error to be less than .0001 if f(x)=cos(2x) and you are approximating f(0.6)

I really don't know what I am doing. Here's what I've tried to do:

Rn(.6) = ( (f^(n+1)(z)) / (n+1)! ) (.6)^(n+1)

I don't know where to go from here....

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# Homework Help: Maclaurin errors

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