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数学
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Sin^2 45°+cos^2 45°=?
人气：431 ℃ 时间：2020-03-31 02:51:16
解答
sin45°=√2/2,cos45°=√2/2.
sin^2 45°+cos^2 45°
=(√2/2)^2+(√2/2)^2
=1
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