In the problem, t is a real number and P = (x, y) is the point on the unit circle that corresponds to t. Find the exact value of
the indicated trigonometric function of t.
-$\left( - \frac { \sqrt { 39 } } { 8 } , \frac { 5 } { 8 } \right) \quad$ Find $\cos t$
A)$ - \frac { \sqrt { 39 } } { 5 }$
B) $\frac { 5 } { 8 }$
C)$ - \frac { 8 \sqrt { 39 } } { 39 }$
D) $- \frac { \sqrt { 39 } } { 8 }$

Question

Quizplus · Accepted Answer

The cosine of an angle in the unit circle is equal to the x-coordinate of the point on the circle, which is $- \frac { \sqrt { 39 } } { 8 }$.

In the Problem, T Is a Real Number and P (−398,58)\left( - \frac { \sqrt { 39 } } { 8 } , \frac { 5 } { 8 } \right) \quad(−839​​,85​)

In the Problem, T Is a Real Number and P $\left( - \frac { \sqrt { 39 } } { 8 } , \frac { 5 } { 8 } \right) \quad$