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Thank you for your reply. the assumptions on z is a mistake, i have put assumptions on z^2 but forgot to suppress it all... thank you for the remark. But still don't work. I will try with polar coordinates . |
Discussions |
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Thank you for your reply. the assumptions on z is a mistake, i have put assumptions on z^2 but forgot to suppress it all... thank you for the remark. But still don't work. I will try with polar coordinates . |