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

Find the exact value of the expression using the provided information.
-Find $\cos ( \mathrm { s } - \mathrm { t } )$ given that $\cos \mathrm { s } = - \frac { 12 } { 13 }$ , with $\mathrm { s }$ in quadrant II, and $\sin \mathrm { t } = \frac { 15 } { 17 }$ , with $\mathrm { t }$ in quadrant II.

A) $- \frac { 171 } { 221 }$

B) $\frac { 21 } { 221 }$

C) $- \frac { 21 } { 221 }$

D) $\frac { 171 } { 221 }$

Correct Answer:

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