Is this a correct mathematical solution?

  • #26
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(No, the photo is vague about that. But anyway:)

If you want the x component to be cosθ, you must integrate from -π/2 to π/2 :wink:
ohhh you are correct too
thanks
 
  • #27
dx
Homework Helper
Gold Member
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If it's like that, then you integrate from 0 to pi, and it will be sin.

If you measure it from the negative x-axis, it will be cos, and the limits will be -pi/2 to pi/2.
 
  • #28
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but it Cartesian system on polar coordinates.
i need to draw cartesian x axes and y axes even if it polar coordinates
?
 
  • #29
dx
Homework Helper
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You can use both at the same time for different parts of the problem, nothing wrong with that.
 

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