cos(0.25π-x)=

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cos(0.25π-x)=cos(0.25π-x)=cos(0.25π-x)=cos(0.25π-x)=sin(0.5π+x-0.25π)=sin(x-0.25π)

cos(0.25π-x)=
cos(0.25π-x)=

cos(0.25π-x)=
cos(0.25π-x)=sin(0.5π+x-0.25π)=sin(x-0.25π)