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Solve the equation on the interval [tex]$[0, 2\pi)$[/tex].

[tex]\[ \sqrt{3} \cot (x) - 1 = -2 \][/tex]


Sagot :

Certainly! Let's solve the equation [tex]\(\sqrt{3} \cot(x) - 1 = -2\)[/tex] within the interval [tex]\([0, 2\pi)\)[/tex].

### Step-by-Step Solution:

1. Start with the given equation:

[tex]\[ \sqrt{3} \cot(x) - 1 = -2 \][/tex]

2. Isolate [tex]\(\cot(x)\)[/tex]:

Add 1 to both sides of the equation:

[tex]\[ \sqrt{3} \cot(x) = -1 + 1 \][/tex]

Simplify the right-hand side:

[tex]\[ \sqrt{3} \cot(x) = -1 + 1 = -1 + 1 = 0 \][/tex]

3. Divide both sides by [tex]\(\sqrt{3}\)[/tex]:

To isolate [tex]\(\cot(x)\)[/tex]:

[tex]\[ \cot(x) = -\frac{1}{\sqrt{3}} = -\frac{1}{\sqrt{3}} \][/tex]

4. Recognize the exact value:

We know that:

[tex]\[ \cot(x) = \frac{\cos(x)}{\sin(x)} = -\frac{1}{\sqrt{3}} \][/tex]

This implies:

[tex]\[ \frac{\cos(x)}{\sin(x)} = -\frac{1}{\sqrt{3}} \][/tex]

5. Find the corresponding angle:

The cotangent function [tex]\(\cot(x) = -\frac{1}{\sqrt{3}}\)[/tex] corresponds to angles where the tangent function [tex]\(\tan(x) = -\sqrt{3}\)[/tex] because [tex]\(\cot(x) = \frac{1}{\tan(x)}\)[/tex].

The value [tex]\(\tan(x) = -\sqrt{3}\)[/tex] occurs at:

[tex]\[ x = \frac{4\pi}{3}, \quad x = \frac{7\pi}{3} \][/tex]

6. Verify these solutions within the interval [tex]\([0, 2\pi)\)[/tex]:

[tex]\[ \frac{4\pi}{3} \quad \text{is in} \quad \left[0, 2\pi\right) \][/tex]

[tex]\[ \frac{7\pi}{3} \quad \text{is not in} \quad \left[0, 2\pi\right) \][/tex]

Therefore, within the interval [tex]\([0, 2\pi)\)[/tex], the valid solution is:

[tex]\[ x = \frac{4\pi}{3} \][/tex]

Thus, the solution to the equation [tex]\(\sqrt{3} \cot(x) - 1 = -2\)[/tex] within the interval [tex]\([0, 2 \pi)\)[/tex] is:

[tex]\[ \boxed{\frac{4\pi}{3}} \][/tex]