cos(-17/6π)+tan(-17/6π)
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cos(-17/6π)+tan(-17/6π)
cos(-17/6π)+tan(-17/6π)
cos(-17/6π)+tan(-17/6π)
cos(-17/6π)+tan(-17/6π)
=-cos(π/6)+tan(π/6)
=-√3/2+√3/3
=-√3/6
cos(-17/6π)+tan(-17/6π)
=cos(7/6π-4π)+tan(1/6π-3π)
=cos(7/6π)+tan(1/6π)
=-√3/2+√3/3
=-√3/6
cos(-17/6π)+tan(-17/6π)
计算tan(-1560度)cos(17π/6)
sin【-6分之17π】+cos【-3分之20π】+tan【-6分之53π】=
sin(-1920°)=?cos(-1560°)=?tan(-17π/6)=?
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