sin(-11π/4)
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![sin(-11π/4)](/uploads/image/z/15237092-20-2.jpg?t=sin%28%EF%BC%8D11%CF%80%2F4%EF%BC%89)
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sin(-11π/4)
sin(-11π/4)
sin(-11π/4)
sin(-11π/4)
=-sin(11π/4)
=-sin(11π/4-2π)
=-sin(3π/4)
=-sin(π-π/4)
=-sin(π/4)
=-√2/2
你问的是什么?sin(5/4)
sin(-11π/4)
=-sin(11π/4)
=-sin(2π+3π/4)
=- sin(3π/4)
=-sin(π-π/4)
=-sinπ/4
=-根号2/2
sin(-11π/4)=sin(-3π/4)=sin(5π/4)=√2/2=1.414/2=0.707