Fig165.tex

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\psline(!6 30 cos mul neg 6 30 sin mul neg)
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\uput[195](4;195){$\THETA$}
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\psdots(! 2 neg 2 30 dup sin exch cos div mul neg)
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\uput[-20](! 2 neg 2 30 dup sin exch cos div mul neg){P}
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\uput[-90](!6 30 cos mul neg 6 30 sin mul neg){L}
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