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Triangle $ABC$ is a right triangle with right angle at $B$.

If $\csc A = \frac{25}{7}$, what is $\cos A$?

A

$ {\cfrac { 7 }{ 25 } } $

B

$ {\cfrac { 18 }{ 25 } } $

C

$ {\cfrac { 7 }{ 24 } } $

D

$ {\cfrac { 24 }{ 7 } } $

E

$ {\cfrac { 24}{ 25 } } $

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