Determine the Signs of the Given Trigonometric Functions of an Angle

Determine the signs of the given trigonometric functions of an angle in standard position with the given measure.
-Find $\cos \theta$ , given that $\tan \theta = - \frac { 8 } { 9 }$ and $\sin \theta > 0$ .

A) $- \frac { \sqrt { 145 } } { 9 }$
B) $\frac { 9 \sqrt { 145 } } { 145 }$
C) $\frac { \sqrt { 145 } } { 8 }$
D) $- \frac { 9 \sqrt { 145 } } { 145 }$

Correct Answer:

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