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| 1. |
If 0 lt phi lt pi//2 , and x = sum_(n = 0)^(infty) cos^(2n) phi, y = sum_(n=0)^(infty) sin^(2n ) phi and z = sum_(n=0)^(infty) cos^(2n) phi sin^(2n) phi, then |
| Answer» Answer :A::C | |