嗯再问你一提,根号1-sin40度cos40度/cos40度-根号1-sin2(为平方)50度=
人气:287 ℃ 时间:2020-01-28 10:54:59
解答
√(1-2sin40°cos40°)/[cos40°-√(1-sin^50°)]
=(cos40°-sin40°)/[cos40°-cos50°]
=1(∵sin40°=cos50°).
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