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[" (a) "1.],[" 20."(1)/(x)x+(1)/(x)=2cos...

[" (a) "1.],[" 20."(1)/(x)x+(1)/(x)=2cos thetavec " th "x^(3)+(1)/(x^(3))((b))/(sigma/" (lot ")ddot z" : "],[[" (a) "cos3 theta," (b) "sin3 theta]]

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