1.

If −π2<x<π2 and the sum to infinite number of terms of the series cosx+23cos x sin2 x+49cos x sin4 x+..... is finite, then x lies in the set

Answer»

If π2<x<π2 and the sum to infinite number of terms of the series cosx+23cos x sin2 x+49cos x sin4 x+..... is finite, then x lies in the set




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