确定tan(-17π/5)符号,

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确定tan(-17π/5)符号,
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确定tan(-17π/5)符号,
确定tan(-17π/5)符号,

确定tan(-17π/5)符号,
tan(-17π/5)
=tan[-4π+(3π/5)]
=tan(3π/5)
而角3π/5是第二象限角,则:tan(3π/5)

tan(-17π/5)
=tan(4π-17π/5)
=tan(3π/5)
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