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1-1-2-1-x-2-1-2-3-4-1-x-4-1-2-3-4-5-6-1-x-6-




Question Number 135385 by rs4089 last updated on 12/Mar/21
1−(1/2) (1/x^2 )+(1/2)(3/4) (1/x^4 )−(1/2)(3/4)(5/6) (1/x^6 )+....=?
$$\mathrm{1}−\frac{\mathrm{1}}{\mathrm{2}}\:\frac{\mathrm{1}}{{x}^{\mathrm{2}} }+\frac{\mathrm{1}}{\mathrm{2}}\frac{\mathrm{3}}{\mathrm{4}}\:\frac{\mathrm{1}}{{x}^{\mathrm{4}} }−\frac{\mathrm{1}}{\mathrm{2}}\frac{\mathrm{3}}{\mathrm{4}}\frac{\mathrm{5}}{\mathrm{6}}\:\frac{\mathrm{1}}{{x}^{\mathrm{6}} }+….=? \\ $$

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