u/(蟺/2)=sin尾+sin伪 2u/蟺=sin尾+sin(蟺/2-尾)2u/蟺=sin尾+cos尾 2u/蟺=鈭?(鈭?/2sin尾+鈭?/2cos尾)2u/蟺=鈭?(sin尾cos蟺/4+cos尾sin蟺/4)2u/蟺=鈭?sin(尾+蟺/4)u=蟺鈭?/2sin(尾+蟺/4)-1<=sin(尾+蟺/4)<=1 镓€浠?镄勬渶澶у€间负:蟺鈭?...
u/(伪+尾)=sin尾+sin伪 u/(蟺/2)=sin尾+sin伪 2u/蟺=sin尾+sin(蟺/2-尾)2u/蟺=sin尾+c...
回答者:网友 u=伪sin尾+伪sin伪+尾sin伪+尾sin尾u=伪sin尾+尾sin尾+伪sin伪+尾sin伪u=(伪+尾)sin尾+(伪+尾)sin伪u/(伪+尾)=sin尾+sin伪u/(蟺/2)=sin尾+sin伪2u/蟺=sin尾+sin(蟺/2-尾)2u/蟺=sin尾+cos尾2u/蟺=鈭?(鈭?/2sin尾+鈭?/2cos尾)2u/蟺=鈭?(sin尾cos蟺/4+cos尾sin...