Use the Fundamental Identities to Find the Value of the Trigonometric

Multiple Choice

Use the fundamental identities to find the value of the trigonometric function.
-Find $\cos \theta$ , given that $\tan \theta = - \frac { 4 } { 7 }$ and $\sin \theta > 0$ .

A) $- \frac { \sqrt { 65 } } { 7 }$

B) $\frac { \sqrt { 65 } } { 4 }$

C) $\frac { 7 \sqrt { 65 } } { 65 }$

D) $- \frac { 7 \sqrt { 65 } } { 65 }$