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in Algebra by (15 points)
3. What is the value of the series \[ \left(1-\frac{1}{2 !}+\frac{1}{4 !}-\cdots\right)^{2}+\left(1-\frac{1}{3 !}+\frac{1}{5 !}-\cdots\right)^{2} ? \]

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1 Answer

+1 vote
by (10.9k points)
Given expression

= {(e+e^-1)/2}^2+{e-e^-1)/2}^2

=1/4×2(e^2+e^-2)

=1/2(e^2+e^-2)
by (15 points)
Hey can you pls elaborate a bit

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