
比较tan(-13π/4)与tan(-12π/5)的大小
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tan(-13π/4)=tan(-5π/4)=tan(3π/4)
tan(-12π/5)=tan(-2π/5)=-tan(2π/5)=tan(3π/5)
3π/5<3π/4
tan(3π/5)>tan(3π/4
tan(-13π/4)<tan(-12π/5)
tan(-12π/5)=tan(-2π/5)=-tan(2π/5)=tan(3π/5)
3π/5<3π/4
tan(3π/5)>tan(3π/4
tan(-13π/4)<tan(-12π/5)
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