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If 0 ltphilt (pi)/(2) ,x= sum_(n=0)^(oo)cos^(2n) phi,y sum _(n=0)^(oo)sin^(2n) phiandz= sum_(n=0) ^(oo) cos ^(2n) phisin^(2n) phi ,then |
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Answer» `XYZ=xz+y` |
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