设区域D由圆x2+y2=2ax(a﹥0)围成,则二重积分∫∫De-x2-y2dσ=()
A.2∫0π/2dθ∫02acosθe-r2dr B.∫-(π/2)π/2dθ∫02acosθe-r2dr C.∫0πdθ∫02acosθe-r2rdr D.∫-(π/2)π/2dθ∫02acosθe-r2rdr正确答案D
设区域D由圆x2+y2=2ax(a﹥0)围成,则二重积分∫∫De-x2-y2dσ=()
A.2∫0π/2dθ∫02acosθe-r2dr B.∫-(π/2)π/2dθ∫02acosθe-r2dr C.∫0πdθ∫02acosθe-r2rdr D.∫-(π/2)π/2dθ∫02acosθe-r2rdr正确答案D