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if cos 20 - sin 20=p, find the value of cos 40 in terms of p
DEar Beverly
cos 20 - sin 20=p
square it
cos220 + sin220 -2sin20cos20 =p2
sin40 =1-p2
and cos40 =(1-sin240)1/2
=(2p2-p4)1/2
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