Problem

Use identities to find values of the sine and cosine functions of the function for the angle measure. $2 x$, given $\tan x=-2$ and $\cos x<0$ \[ \cos 2 x=-\frac{3}{5} \] (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.) \[ \sin 2 x= \] (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)

Solution

Step 1 :We are given that \(\tan x = -2\) and \(\cos x < 0\).

Step 2 :We can use the Pythagorean identity \(\sin^2 x + \cos^2 x = 1\) to find the value of \(\sin x\) and \(\cos x\).

Step 3 :Then we can use the double angle formulas \(\sin 2x = 2\sin x \cos x\) and \(\cos 2x = \cos^2 x - \sin^2 x\) to find the values of \(\sin 2x\) and \(\cos 2x\).

Step 4 :The value of \(\cos 2x\) is \(-\frac{3}{5}\).

Step 5 :The value of \(\sin 2x\) is approximately -0.8.

Step 6 :We need to simplify the expression for \(\sin 2x\).

Step 7 :The final answer is \(\boxed{-\frac{4}{5}}\).

From Solvely APP
Source: https://solvelyapp.com/problems/7651/

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