The Maclurin series expansion of cos²x -sin²x is - (-2)* x²* * k! a) 8 k b) $ (−1)* .x² k=1 (2k)! c) k=1 d) 8 k=1 (-2)* ₁²* (2k)! (-4) * x² k K-1 (2k)! k=1

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Q: Please correctly and handwritten

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