[理工] 工數向量作功
_ _ _
if F = (x-y)/(x^2+y^2)i+(x+y)/(x^2+y^2)j is a defined in a simply
connected domain R. evaluate the integral
_ _
∫F‧dr
c
along the path r=2+(4Θ/5π) from (x1,y1)=(2,0)
to (x2,y2)=(0,4),where r and Θ are polar coordinates .
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