已知sin(a-TT/4)=1/3则cos(a+TT/4)为

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已知sin(a-TT/4)=1/3则cos(a+TT/4)为已知sin(a-TT/4)=1/3则cos(a+TT/4)为已知sin(a-TT/4)=1/3则cos(a+TT/4)为cos(a+TT/4

已知sin(a-TT/4)=1/3则cos(a+TT/4)为
已知sin(a-TT/4)=1/3则cos(a+TT/4)为

已知sin(a-TT/4)=1/3则cos(a+TT/4)为
cos(a+TT/4)=cos(TT/2+a-TT/4)=-sin(a-TT/4)=-1/3

TT/4?什么意思?