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Trigonometry
Question

Use identities to find values of the sine and cosi...

Use identities to find values of the sine and cosine functions of the function for the angle measure. 

\( 2 x \) , given \( \tan x = - 4 \) and \( \cos x > 0 \) 

\( \cos 2 x = \frac { - 15} { 17} \) 

(Simplify your answer, including any radicalsf Use integers or fractions for any numbers in the expression.) 

\( \sin 2 x = \square \) 

(Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.) 

Answer

\(\frac { - 8} { 27} \)

Solution
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