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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: prove it and get a hat
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[Post New]8 Sep 2007 17:48:03 IST
    Subject: prove it and get a hat
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akumar_ak (6)

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Prove: sin ? = [ e^(i?) - e^(-i?) ] / 2i and cos ? = [ e^(i?) + e^(-i?) ] / 2?
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[Post New]8 Sep 2007 18:28:40 IST
    Subject: Re:prove it and get a hat
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nadeemoidu (1184)

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e i  = cos + i sin
e -i = cos(-) +i sin (-)
       = -cos() +i sin ()

Now just substitute.
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