(sinα+2cosα)/(4cosα-sinα)=(2+tana)/(4-tana)=2记p=圆周率/4 t=根号2tana=2 sina=2cosa 2sinacosa=4cosacosa sin2a=4cosacosasinasina=4cosacosa=sin2a cosacosa=0.2tsin(2a+p)+1=t(sin2acosp+cos2asinp)+1=0.5...