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cos(9π/4)+tan(-7π/6)+sin(21π)=
人气:443 ℃ 时间:2020-05-08 22:47:44
解答
cos(9π/4)+tan(-7π/6)+sin(21π)
=cosπ/4-tan(π/6)+0
=√2/2-√3/3sin21π怎么化?sin(21π)=sin(20π+π)=sinπ=0
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