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xsinyDs,其中l:x=3t

L:x² + y² = 1 用参数方程化简: { x = cost、dx = - sint dt { y = sint、dy = cost dt 0 ≤ t ≤ π/2 ds = √[(dx)² + (dy)²] = √[(- sint)² + (cost)²] dt = dt ∫L (ye^x * siny - xe^x * cosy) ds = ∫(0,π/2) ...

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