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sin25π/4+cos25π/3+tan(-25π/4)=
人气:214 ℃ 时间:2020-06-27 14:14:16
解答
原式= sin(6π+π/4)+cos(8π+π/3)+tan(-6π-π/4)
=sinπ/4+cosπ/3-tanπ/4
=√2/2+1/2-1
=(√2-1)/2
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