sin60+cos30-cos45=?
人气:387 ℃ 时间:2020-05-25 11:14:26
解答
sin60+cos30-cos45
=sin60+sin(90-30)-cos45
=sin60+sin60-cos45
=2sin60-cos45
=2×(√3/2)-(√2/2)
=√3-(√2/2)
注:√表示根号
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