结束结束解例 14 xey
1s i n
求 dxdy?
解 )1(1c o s)1(s in)(
1sin1sin1sin
xxexeedxdy xxx 解 )1(1c o s)1( s in)
1s i n1s i n1s i n
xxexedxdy xxx 解 )1(1c o s)1( s in)( s i n
1s i n1s i n
xxexeedxdy xx
xex x 1c o s1
1s i n
2