Use the Value of the Trigonometric Function to Find $\cos ( \pi - t )$

Use the value of the trigonometric function to find $\cos ( \pi - t )$ .​ $\cos t = \frac { 5 } { 6 }$ ​

A) $\cos ( \pi - t ) = \frac { 5 } { 6 }$
B) $\cos ( \pi - t ) = - \frac { 5 } { 6 }$
C) $\cos ( \pi - t ) = \frac { 6 } { 5 }$
D) $\cos ( \pi - t ) = \infty$
E) $\cos ( \pi - t ) = - \frac { 6 } { 5 }$

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