作业帮求值sin17/6π,cos(-43π/6),tan(-1560°)
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求值sin17/6π,cos(-43π/6),tan(-1560°)
求值sin17/6π,cos(-43π/6),tan(-1560°)
求值sin17/6π,cos(-43π/6),tan(-1560°)
sin17/6π=sin(2π+5π/6)=sin5π/6=sin(π-π/6)=sinπ/6=1/2
cos(-43π/6)=cos43π/6=cos(6π+7π/6)=cos7π/6=cos(π+π/6)=-cosπ/6=-根号3/2
tan(-1560°)=-tan1560°=-tan(1440°+120°)=-tan120°=-tan(180°-60°)=tan60°=根号3
求值sin17/6π,cos(-43π/6),tan(-1560°)
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