Mathematics
Senior High
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cos-2θはなぜcos2θと同じなのですか？？
(3) Cos20cos 40 = = [cos (20+40) + cos (20-40)4
=1/2(cos6日10520)
4.
(3) cos 20 cos 40 = £ fees (20+40) + cos (20-40)}
= £fcos 60 + cos(-20)]
₤ (cos 60+ cos20)
い
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