比较大小sin(-π/4)与sin(π/6)RT 2:cos(-23π/5)与cos(-17π/4)

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比较大小sin(-π/4)与sin(π/6)RT 2:cos(-23π/5)与cos(-17π/4)
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比较大小sin(-π/4)与sin(π/6)RT 2:cos(-23π/5)与cos(-17π/4)
比较大小sin(-π/4)与sin(π/6)
RT
2:cos(-23π/5)与cos(-17π/4)

比较大小sin(-π/4)与sin(π/6)RT 2:cos(-23π/5)与cos(-17π/4)
sin(π/6)=1/2>0
sin(-π/4)=-√2/2