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Problem 7.6

12 November, 2015 - 11:22

Find the Taylor series expansion of cos xaround x= 0. Check your work by combining the first two terms of this series with the first term of the sine function from example 85 on page 112 to verify that the trig identity sin^{2}x+cos^{2}x=1  holds for terms up to order x^{2} .