1. **State the problem:** Solve the trigonometric equation $$2\cos(x) - 1 = 0$$ for $$x$$ in the interval $$[0, 2\pi)$$.
2. **Use the formula and rules:** To solve for $$x$$, isolate $$\cos(x)$$:
$$2\cos(x) - 1 = 0$$
Add 1 to both sides:
$$2\cos(x) = 1$$
Divide both sides by 2:
$$\cancel{2}\cos(x) = \frac{1}{\cancel{2}}$$
which simplifies to:
$$\cos(x) = \frac{1}{2}$$
3. **Find all solutions for $$\cos(x) = \frac{1}{2}$$ on $$[0, 2\pi)$$:**
Recall that $$\cos(x) = \frac{1}{2}$$ at angles where the cosine value is positive one-half. This occurs at:
$$x = \frac{\pi}{3}$$ and $$x = 2\pi - \frac{\pi}{3} = \frac{5\pi}{3}$$
4. **Final answer:**
$$x = \frac{\pi}{3}, \frac{5\pi}{3}$$
These are the two solutions in the interval $$[0, 2\pi)$$.
Solve Cosine 81090A
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