sin(a–10π)怎么运算 matlab 计算sin（π/10),结果精确到100位小数
sin(\u03c0\u2013(a+b))=sinc\u4e48\u4f60\u597d\uff1a
\u5728\u4e09\u89d2\u5f62\u91cc\uff0c\u4e09\u4e2a\u89d2\u662f\uff1aa\uff0cb\uff0cc
sin\uff08\u03c0-\uff08a+b\uff09\uff09=sinc
\u56e0\u4e3a\uff1aa+b+c=\u03c0
\u03c0-\uff08a+b\uff09=c
sin\uff08\u03c0-\uff08a+b\uff09\uff09
=sin\uff08c\uff09
\u9996\u5148\u5728matlab\u547d\u4ee4\u7a97\u53e3\u8f93\u5165f=@(x)-(x*sin(10*pi*x)+2) \u8f93\u51fa\u7ed3\u679c\u4e3a
>> f=@(x)-(x*sin(10*pi*x)+2)
f = @(x)-(x*sin(10*pi*x)+2)
故sin(α-10π)=sin(α-10π+2·5π)=sinα
。
sin(a–10π)=sina，诱导公式
sinα=sin(α+2nπ),(n∈Z)
=一sina
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