A、∫0πdθ∫02acosθf(rcosθ,rsinθ)rdr B、∫0πdθ∫02asinθf(rcosθ,rsinθ)rdr C、∫-π/2π/2dθ∫02acosθf(rcosθ,rsinθ)rdr D、∫-π/2π/2dθ∫02asinθf(rc

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问题

选项 A、∫0πdθ∫02acosθf(rcosθ,rsinθ)rdr
B、∫0πdθ∫02asinθf(rcosθ,rsinθ)rdr
C、∫-π/2π/2dθ∫02acosθf(rcosθ,rsinθ)rdr
D、∫-π/2π/2dθ∫02asinθf(rcosθ,rsinθ)rdr

答案B

解析
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