Math Problem Statement

Solve the equation cot(x)sin(x) + cot(x) = 0 and identify the correct solution from the provided options.

Solution

We are tasked with solving the equation cot(x)sin(x)+cot(x)=0\cot(x) \sin(x) + \cot(x) = 0.

Step 1: Factor the expression

We can factor out cot(x)\cot(x) from the equation:

cot(x)(sin(x)+1)=0\cot(x) (\sin(x) + 1) = 0

Step 2: Solve for each factor

Now, we solve for each factor separately.

Case 1: cot(x)=0\cot(x) = 0

The cotangent function, cot(x)\cot(x), is zero when:

x=π2+nπfor integersnx = \frac{\pi}{2} + n\pi \quad \text{for integers} \, n

Case 2: sin(x)+1=0\sin(x) + 1 = 0

This implies that sin(x)=1\sin(x) = -1, which happens at:

x=3π2+2nπfor integersnx = \frac{3\pi}{2} + 2n\pi \quad \text{for integers} \, n

Step 3: Combine solutions

The solutions to the equation come from both cases:

  1. x=π2+nπx = \frac{\pi}{2} + n\pi
  2. x=3π2+2nπx = \frac{3\pi}{2} + 2n\pi

Step 4: Identify the correct option

Comparing these solutions to the choices provided in the image, the correct answer matches:

x=π2+nπandx=3π2+2nπx = \frac{\pi}{2} + n\pi \quad \text{and} \quad x = \frac{3\pi}{2} + 2n\pi

This corresponds to the second option:
π2+nπ,3π2+2nπ\boxed{\frac{\pi}{2} + n\pi, \quad \frac{3\pi}{2} + 2n\pi}

Would you like more details, or do you have any questions? Here are five related questions to expand on this:

  1. What is the general form for solving trigonometric equations involving cotangent?
  2. How can we interpret the periodicity of trigonometric functions in solutions?
  3. Why does cot(x)\cot(x) have zeros at π2+nπ\frac{\pi}{2} + n\pi?
  4. What happens when you apply similar techniques to secant or cosecant equations?
  5. How does factoring help in solving complex trigonometric equations?

Tip: Always check the domain of trigonometric functions, as they can introduce restrictions in certain cases.

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Cotangent Function
Sine Function
Factoring

Formulas

cot(x) = cos(x)/sin(x)
sin(x) = -1
cot(x) = 0

Theorems

Cotangent and sine function properties
Factoring trigonometric expressions

Suitable Grade Level

Grades 10-12