Solving absolute values of trigonometry

In summary, there are three solutions for the equation 2sin3x=1 or 2sin3x=-1, which are represented by the points where sin3x=1/2 or sin3x=-1/2 on the unit circle within the domain of 0≤θ≤3π. However, the correct answer is (C), and not (B).
  • #1
Physics53
9
0

Homework Statement


math question.PNG


Homework Equations

The Attempt at a Solution


2sin3x=1 OR 2sin3x= -1
sin3x=1/2 sin3x= -1/2
From the unit circle and in accordance with the domain
there are 3 solutions (B)
But the answer is (C)
HOW?
 

Attachments

  • math question.PNG
    math question.PNG
    2.5 KB · Views: 598
Physics news on Phys.org
  • #2
Physics53 said:

Homework Statement


View attachment 229661

Homework Equations

The Attempt at a Solution


2sin3x=1 OR 2sin3x= -1
sin3x=1/2 sin3x= -1/2
From the unit circle and in accordance with the domain
there are 3 solutions (B)
But the answer is (C)
HOW?
In your problem, ##\theta = 3x## runs from ##\theta = 0## to ##\theta = 3 \pi.## Look at a plot of ##y = \sin \theta## for ##0 \leq \theta \leq 3 \pi.## How many places are there at which ##\sin \theta = 1/2## or ##\theta = -1/2?##
 

Related to Solving absolute values of trigonometry

1. What is an absolute value in trigonometry?

In trigonometry, an absolute value represents the distance of a number from zero on a number line. It is always positive and is typically denoted by two vertical lines around the number.

2. How do you solve absolute values in trigonometry?

To solve absolute values in trigonometry, you must first identify the value inside the absolute value bars. Then, you can either take the positive or negative value, depending on the context of the problem. Finally, you can solve the equation as usual.

3. What are some common techniques for solving absolute values in trigonometry?

Some common techniques for solving absolute values in trigonometry include using the properties of absolute values, graphing the function, and using algebraic manipulation to isolate the absolute value expression.

4. Why is it important to solve absolute values in trigonometry?

Solving absolute values in trigonometry is important because it allows us to find the exact value of a function, rather than just its distance from zero. This is especially useful in real-world applications where finding precise measurements is necessary.

5. Can absolute values be negative in trigonometry?

No, absolute values cannot be negative in trigonometry. As mentioned earlier, absolute values represent the distance from zero, which is always a positive value. However, when solving absolute values in an equation, the solution may be negative depending on the context of the problem.

Similar threads

  • Precalculus Mathematics Homework Help
Replies
11
Views
1K
  • Precalculus Mathematics Homework Help
Replies
10
Views
962
  • Precalculus Mathematics Homework Help
Replies
2
Views
880
  • Precalculus Mathematics Homework Help
Replies
7
Views
1K
  • Precalculus Mathematics Homework Help
Replies
9
Views
811
  • Precalculus Mathematics Homework Help
Replies
32
Views
966
  • Precalculus Mathematics Homework Help
Replies
4
Views
1K
  • Precalculus Mathematics Homework Help
Replies
18
Views
2K
  • Precalculus Mathematics Homework Help
Replies
11
Views
1K
  • Precalculus Mathematics Homework Help
Replies
7
Views
745
Back
Top