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Trigonometry
Question

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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