Find the first four nonzero terms in the Maclaurin series for the function.f(x) = sin x cos x

A. x + x3 - x5 + x7 + . . .
B. 1 + x - x2 - x3 + . . .
C. x - x3 + x5 - x7 + . . .
D. x - x3 + x5 - x7+ . . .

Answer: D

Mathematics

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A.  -  = 1, -? < x < ?
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