Determine All Solutions of the Equation in Radians $\cos ( s + t )$

question 42

Multiple Choice

Determine all solutions of the equation in radians.
-Find $\cos ( s + t )$ given that $\cos s = \frac { 1 } { 3 }$ , with $s$ in quadrant $I$ , and $\sin t = - \frac { 1 } { 2 }$ , with $t$ in quadrant IV.

• A) \(\frac { 2 \sqrt { 6 } + 1 } { 6 }\)
• B) \(\frac { \sqrt { 3 } - 2 \sqrt { 2 } } { 6 }\)
• C) \(\frac { 2 \sqrt { 6 } - 1 } { 6 }\)
• D) \(\frac { \sqrt { 3 } + 2 \sqrt { 2 } } { 6 }\)

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