{ g ig þv cos x + } ¡ g §v3 cos 3.x { 18 } vcosx + } ig þv2 cos 2x . ... x −3 cotg x ( b coser ) - } ( 1 + 3cotg x2 ) ( b cosec x ) 3 ( 3cotg x + 5cotg x3 ) ...
確定! 回上一頁