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比较sin(-879),tan(-33π/8),cos(-13π/10)的大小,
人气:392 ℃ 时间:2020-05-19 16:54:32
解答
sin(-879°)=-sin879°=-sin(2*360°+159°)=-sin(159°)=-sin(180°-21°)=-sin21° ;tan(-33π/8)=-tan(4π+π/8)=-tan(π/8)=-tan22.5°=-0.4142;cos(-13π/10)=cos(13π/10)=cos(π+3π/10)=-cos(3π/10)=-cos...
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