tan(-13pi/4)与tan(-17pi/5)比较大小
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tan(-13π/4)=-tan(13π/4)=-tan(3π+π/4)=-tan(π/4)
tan(-17π/5)=-tan(17π/5)=-tan(3π+2π/5)=-tan(2π/5)
∵2π/5>π/4
∴tan(π/4)<tan(2π/5)
∴-tan(π/4)>-tan(2π/5)
∴tan(-13π/4)>tan(-17π/5)
tan(-17π/5)=-tan(17π/5)=-tan(3π+2π/5)=-tan(2π/5)
∵2π/5>π/4
∴tan(π/4)<tan(2π/5)
∴-tan(π/4)>-tan(2π/5)
∴tan(-13π/4)>tan(-17π/5)
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