Solution: Alternative means By comparing the first four
Chapter 9, Problem 78(choose chapter or problem)
Alternative means By comparing the first four terms, show that the Maclaurin series for cos2 x can be found (a) by squaring the Maclaurin series for cos x, (b) by using the identity cos2 x = 11 + cos 2x2>2, or (c) by computing the coefficients using the definition.
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