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Question Number 185450 by Mastermind last updated on 22/Jan/23

$$\mathrm{Write}\mathrm{down}\mathrm{the}\mathrm{expansion}\mathrm{of}$$$$\left(\mathrm{a}\right)\mathrm{cosx}\left(\mathrm{b}\right)\frac{1}{\mathrm{l}+\mathrm{x}},\mathrm{and}\mathrm{hence}\mathrm{show}$$$$\mathrm{that}\frac{\mathrm{cosx}}{1+\mathrm{x}}=1-\mathrm{x}+\frac{{\mathrm{x}}^2}{2}-\frac{{\mathrm{x}}^3}{2}+\frac{{13\mathrm{x}}^4}{24}+...$$$$$$$$$$$$\mathrm{M}.\mathrm{m}$$

Commented by Mastermind last updated on 22/Jan/23

$$\mathrm{Hi}$$$$$$

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