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The maximum efficiency of a screw jack is

$\frac { 1 - sin\phi } { 1 + sin\phi }$

$\frac { 1 + sin\phi } { 1 - sin\phi }$

$\frac { 1 - tan\phi } { 1 + tan\phi }$

$\frac { 1 + tan\phi } { 1 - tan\phi }$

Answer : Option A

Explanation :

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