1.

For 0< ϕ < π2, if x=∑∞n=0cos2nϕ, y=∑∞n=0sin2nϕ, z=∑∞n=0cos2n ϕ, then

Answer»

For 0< ϕ < π2, if x=n=0cos2nϕ, y=n=0sin2nϕ, z=n=0cos2n ϕ, then




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