sin(-31π/6)
=-sin(31π/6) 此步骤应用的是奇函数的性质
=-sin[(30+1)π/6]
=-sin(5π+π/6)
=-sin(π+π/6)
=sin(π/6)
=1/2
Sin(－31π／6)
=Sin[－36π+5π)／6]
=sin(-6π+5π/6)
=sin(5π/6)
=sin(π-π/6）
=sin(π/6)
=1/2
Sin(－31／6×π)
=
Sin(－31／6×π+ 6π)
=sin(5π/6)
=sin(π/6)
=1/2
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