The maximum efficiency of a reaction turbine is

\frac{2 sin ^{2} α}{1 + sin ^{2} α}

\frac{2 cos ^{2} α}{1 + cos ^{2} α}

Answer

\frac{1 + sin ^{2} α}{2 sin ^{2} α}

\frac{1 + cos ^{2} α}{2 cos ^{2} α}

Answer: Option B

Answer: Option B

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