sin5π/8=cosπ/8?
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sin5π/8=cosπ/8?sin5π/8=cosπ/8?sin5π/8=cosπ/8?sin(5π/8)=cos(π/8)?sin(5π/8)=sin(π/2+π/8)=cos(π/8),故正确!
sin5π/8=cosπ/8?
sin5π/8=cosπ/8?
sin5π/8=cosπ/8?
sin(5π/8)=cos(π/8)?
sin(5π/8)=sin(π/2+π/8)=cos(π/8),故正确!
前者=cos3兀/8
不等于 应该是 sin(5*pi/8)=cos(3*pi/8)
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