Show that [cis(alpha)+cis(-beta)]^4 + [cis(-alpha)+cis(beta)]^4 = 2^5{[cos(alpha+beta)/2]^4}cos[2alpha-2beta]

Asked by Govardhanan R | 2nd Feb, 2012, 07:57: PM

Expert Answer:

Answered by  | 3rd Feb, 2012, 10:35: AM

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