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
irinina [24]
3 years ago
10

Solve cos^2x + 2cosx + 1 = 0 for x over the interval [0, 2pi ). Can someone please give me a step by step answer. I don't unders

tand at all.
Mathematics
1 answer:
anygoal [31]3 years ago
6 0
Cos²x+2cos x+1=0

We have to do a change of variable.

cos x=t

Then, we have the next square equation.

t²+2t+1=0


We solve this square equation:

t=[-2⁺₋√(4-4)]/2=-1
 if cos x=t  then we have that:

cos x=-1
x=cos⁻¹ -1= π radians    or    180º.

Answer: x=π  (in radians)  or    x=180º   (in degrees). 

You might be interested in
Equation 5 + 2w = y + 5. What is the value of w
belka [17]

Answer:

W = 0

Y = 20

Step-by-step explanation:

6 0
2 years ago
Please help quickly :D
CaHeK987 [17]

Hope this help!!!

Have a nice day!!!

6 0
2 years ago
Is 25,365 cm greater or less than 30 m
anyanavicka [17]
25365cm÷100=m
                          =253.65m
25365 is less than 30m
6 0
3 years ago
[NEED HELP]
Alinara [238K]

Answer:

1. vertical-line test

2.y=x

3.x

4.domain

Step-by-step explanation:

I just did it on edg and it’s right.

3 0
3 years ago
Read 2 more answers
Pls help with this question
Anika [276]

Answer: A: I'm pretty sure

Step-by-step explanation: if you look at the graph the the 2 and 16 are the only lines where the 0 runs across and its also where the ticket prices are.

7 0
2 years ago
Other questions:
  • The formula I = PRT where I = Interest, P = principal, R = rate, and T = time is used to calculate the amount of simple interest
    6·2 answers
  • 2 is blank percent of 25
    14·2 answers
  • Choose as many answers as apply. Which of the following are metric measurements? gallon liter meter pint quart kilogram kilowatt
    10·2 answers
  • A survey asks a random sample of 1500 adults in Ohio if they support an increase in the state sales tax from 5% to 6%, with the
    8·1 answer
  • The table shows how the height of a stack of DVDs depends on the number of DVDs. What is a rule for the height?
    7·2 answers
  • 3/4 (x + 18) = 15 What is x equal to
    14·2 answers
  • Find sin0, cos0, tan0
    12·2 answers
  • Х<br> 32°<br> X =<br> degrees.<br> please
    14·2 answers
  • Brittany irons 1/8 of her shirt in 4 1/2 minutes. How much of her shirt does she iron each minute?
    12·2 answers
  • What is 11+23/60 as a mixed number
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!