If $\sin(\theta) = -\frac{\sqrt{55}}{8}$ and $\theta$ is in the 3rd quadrant, find the exact value of $\cos(\theta)$ \newline $\cos(\theta) = $
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Therefore, we can determine the value of cos(\theta) using the Pythagorean identity: cos^2(\theta) = 1 - sin^2(\theta). Show more…
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