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For 0 lt theta lt ( pi )/(2) , if x = su...

For `0 lt theta lt ( pi )/(2) `, if `x = sum_(n=0)^(oo)cos^(2n) theta, y = sum_(n=0)^(oo) sin^(2n) theta ,z=sum_(n=0)^(oo)cos^(2n) theta sin^(2n) theta`,then `:`

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