Find the Exact Value of the Expression Using the Provided $\cos ( s - t )$

Find the exact value of the expression using the provided information.
-Find $\cos ( s - t )$ given that $\cos s = - \frac { 4 } { 5 }$ , with $s$ in quadrant II, and $\cos t = \frac { 12 } { 13 }$ , with $t$ in quadrant IV.

A) $- \frac { 33 } { 65 }$
B) $- \frac { 63 } { 65 }$
C) $\frac { 63 } { 65 }$
D) $\frac { 33 } { 65 }$

Correct Answer:

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