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October 21, 2025, 08:16:42 pm

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asdfqwerty

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Question
« on: April 26, 2014, 06:59:44 pm »
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I also have a question:
the square roots of i - 1 are 2^(1/4)cis(-5pi/8) and 2^(1/4)cis(3pi/8)
Hence find the exact value of cos (3pi/8)
I have a feeling it is related to that 2^(1/4)cis(3pi/8) root of i-1, but not sure how to apply