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19) Which of the following is true? a) cos(2x]) = 1+ 2x* + 0(x]? ) b) cos(2x ) = 21 + 3 c) cos(2x3) =

19) Which of the following is true? a) cos(2x]) = 1+ 2x* + 0(x]? ) b) cos(2x ) = 21 + 3 c) cos(2x3) = 1 - 2x* + O(x]? ) d) None of the above

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