Use Identities to Find the Exact Value $\cos ( s - t )$

question 153

Multiple Choice

Use Identities to find the exact value.
-Find $\cos ( s - t )$ given that $\cos s = - \frac { 1 } { 2 }$ , with $s$ in quadrant III, and $\cos t = - \frac { 3 } { 5 }$ , with $t$ in quadrant III.

• A) \(\frac { - 3 + 4 \sqrt { 3 } } { 10 }\)
• B) \(\frac { 3 + 4 \sqrt { 3 } } { 10 }\)
• C) \(\frac { 3 - 4 \sqrt { 5 } } { 10 }\)
• D) \(\frac { 3 - 4 \sqrt { 3 } } { 10 }\)

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