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/sci/ - Science & Math

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2210454 No.2210454 [Reply] [Original]

Can any of you guys talk me through this problem? I have tried and tried making little headway.
Thanks in advance!

>> No.2210488

<div class="math">Im(e^{ri})=i\sin(r)</div>

IM means imaginary part, substitute and the series turn geometric and can be summed easily

>> No.2210512

>>2210488
Thanks, I'm not really getting anywhere with that. That was one of the things I've tried before but yeah... Any idea where it's going wrong for me?

I think I may be expanding the wrong thing...

>> No.2210563
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2210563

Anyone willing to halp?

>> No.2210587

I really don't get how one subs in the values... Can someone explain?

>> No.2210619
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2210619

>> No.2210629

>>2210563

Spife and knork are both completely pointless. And the thing in the middle looks like a slightly-warped spork anyway. Fuck I hate your picture!

>> No.2210633

>>2210629
I don't think they're intended to be used. The central one has the features of all 3 main pieces so I guess it'd be the best one but yeah... It sucks.

>> No.2210657
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2210657