Using standard results, or otherwise, find the Maclaurin series, giving the first four non-zero terms, for the

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Using standard results, or otherwise, find the Maclaurin series, giving the first four non-zero terms, for the following functions.

a. f(x) = cos 3x 

b. f(x) = x2/1 – 3x

c. f(x) = cosh (3x/2) 

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