1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vesna [10]
3 years ago
14

Solve 2cos2x + cosx − 1 = 0 for x over the interval [0, 2pi ).

Mathematics
1 answer:
Galina-37 [17]3 years ago
4 0

2cos^2x+cosx-1 = 0

2cos^2x + 2cosx - cosx - 1 = 0

(2cos^2x + 2cosx) - (cosx + 1) = 0

2cosx(cosx + 1) - 1(cosx + 1) = 0

(cosx + 1)(2cosx - 1) = 0

cosx+1 = 0 or 2cosx-1 = 0

cosx+1 = 0 gives cosx = -1, x = PI

2cosx-1 = 0 gives cosx = 1/2, x = PI/3 or x = 5PI/3

answer: x = PI/3 or x = PI or x = 5PI/3
You might be interested in
1.)which of the following actions is NOT a form of transformation
ikadub [295]

Answer:

1. d

2. d

3. c

explanation

1. reflection, rotation, and dilations are all transformations

2. congruent shapes have to have the same shape and size, meaning they also have the same angle measures

3. sometimes, shapes may have the same area and perimeter but be different

7 0
3 years ago
The scale factor between a model to an actual cylindrical silo is 2 centimeters for every 5 meters. The ratio of the areas is .
pishuonlain [190]
Yes I am I just want you in the
5 0
3 years ago
Describe the symmetry of the figure. Identify lines of symmetry, if any. Find the angle and the order of any rotational symmetry
Sophie [7]

Answer:

see below

Step-by-step explanation:

Clearly, if you turn the figure sideways or upside down (rotate 90° or 180°), you do not have the same figure. It has no rotational symmetry.

However, if you reverse it left-to-right, you get exactly the same figure. So, it has line symmetry about a vertical center line.

5 0
3 years ago
W(x) = 3x; find (-3x)
Mashutka [201]
So this means W(-3x) = 3x. So it's equal to 3(-3x), which simplifies to be -9x. Whenever you have a function, it looks like f(x). f doesn't have to be the letter, it can be a, b, c, or like in this case, W. It just means the output of what W(x) is if x equals the number in the parentheses, which is -3x in this case.
7 0
3 years ago
-7•(-9) <br><br> need help on this one with full work including
Veseljchak [2.6K]

Answer:

-7×-9

=63

Step-by-step explanation:

If u multiple - with -, I'll get + sign

6 0
3 years ago
Read 2 more answers
Other questions:
  • which pair of words is an example of slant rhyme? a. slow/silent b. bodies/ladies c. moon/soon d. flower/plant
    9·1 answer
  • #1,2,2,3,5,6,7 I need work shown also please help
    15·1 answer
  • Write in simplest form please
    15·2 answers
  • the measure of angle W is 100 degrees, and the measure of angle Z is 68 degrees. what is the measure of angle Y
    13·2 answers
  • Is an equation with an integer coefficient will always have an integer solution true or false?
    6·1 answer
  • A student solved for the radius of a circle with a circumference of 12π
    5·1 answer
  • Question 8
    11·1 answer
  • -3/4 ÷ 2/9=<br><br><br><br><br>I've missed days of school and am super. lost​
    10·1 answer
  • 1st drop down answers are
    9·2 answers
  • I need help quick! (number 7, NOT 8!)
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!