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Find sum of series [solved]

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abhas
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PostSubject: Find sum of series [solved] Wed Aug 27, 2008 6:32 pm




By Euler's formula .

Consider, .

Then, the sum in 1) of the problem is , and that in 2) is .

Here and represents, respectively, the real and the imaginary part of the complex number .

Now,









where I have used the fact that, for ,

.

Now, we see that



So we get, and .

Accordingly,

1)

2)
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PostSubject: model paper of I.sc 2009 from U.p board Wed Jan 14, 2009 10:51 pm

Dear sir/madam
i need model paper of subject Hindi/phy/chem/bio and eng
with answer if its possible please help me & send me an my email
my email address is given below

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PostSubject: Re: Find sum of series [solved] Thu Feb 19, 2009 12:10 pm

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