sin(-5π/4)=

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sin(-5π/4)=sin(-5π/4)=sin(-5π/4)=sin(-5π/4)=sin(-5π/4+2π)=sin(3π/4)=sin(π-3/4π)=sinπ/4=(√2)/2(这个就是45

sin(-5π/4)=
sin(-5π/4)=

sin(-5π/4)=
sin(-5π/4)=sin(-5π/4+2π)=sin(3π/4)=sin(π-3/4π)=sinπ/4=(√2)/2 (这个就是45度的sin值)
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