Use the Fundamental Identities to Find the Value of the Trigonometric

question 335

Multiple Choice

Use the fundamental identities to find the value of the trigonometric function.
-Find $\cos \theta$ if $\tan \theta = 3$ and $\sin \theta < 0$

• A) \(- \frac { \sqrt { 10 } } { 3 }\)
• B) \(- \frac { \sqrt { 10 } } { 10 }\)
• C) \(- 10\)
• D) \(\frac { 1 } { 3 }\)

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