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
Alexxandr [17]
3 years ago
15

Giải phương trình : 8cos 4 x – 4cos2x + sin4x – 4 = 0

Mathematics
1 answer:
alex41 [277]3 years ago
5 0

Answer:

Step-by-step explanation:

8(1+cos2x/2)^{2} -4c0s2x+sin4x-4=0\\2(1+2cos2x+cos^{2}2x )-4cos2x+sin4x-4=0\\2cos^{2} 2x+sin4x-2=0\\1+cos4x+sin4x-2=0\\cos4x+sin4x=1\\sin(4x+\pi /4)=sin\frac{\pi }{4} \\\left \{ {{4x+\frac{\pi }{4} =\frac{\pi }{4}+k2\pi  } \atop {4x+\frac{\pi }{4} =\frac{3\pi }{4} +k2\pi \\

You might be interested in
WILL GIVE BRAINLIEST! In the figure, a∥b and m∠1 = 34°.
dsp73

Answer:

I think maybe angle 7 is =34 degrees

Step-by-step explanation:

I am really not good at this

7 0
3 years ago
A one year membership to metro gym costs $460. There is a fee of $40 when you join, and the rest is paid monthly. Write an equat
zysi [14]

Answer: The equation that would help members to find how much they would pay per month is

40 + 12x = 460

Step-by-step explanation:

Let x represent the amount of money that members would pay per month.

Let y represent the number of months for which a member uses the gym.

There is a fee of $40 when you join, and the rest is paid monthly. This means that the cost of using the gym for x months would be

40 + xy

A one year membership to metro gym costs $460. Therefore are 12 months in a year. Therefore,

40 + 12x = 460

12x = 460 - 40 = 420

x = 420/12 = 35

The equation that would help members to find how much they would pay per month is

8 0
3 years ago
There is a markup of 40% on the original price of a fan. If the fan was sold for $42, what was its original price
Akimi4 [234]

Answer:   21$ that is the answer

Step-by-step explanation:

4 0
3 years ago
6. a. Name a pair of equations that have exactly one point of intersection. How do you know?
True [87]

Answer:

A system of linear equations will have exactly one point of intersection, for example:

2x+y=5

-x+y=2

However, a system of linear equations with no solution will have no points of intersection, for example:

-4x+10y=6

2x-5y=3

Sorry about c. though I'm confused on how a pair of equations can have infinite points of intersection unless x or y equals all real numbers which could happen if x or y both equaled all real numbers maybe

And the point of interesection for the system of equations in the problem you attached as an image is (2,-1)

I attached a photo below, and one of how to graph it

4 0
3 years ago
Consider functions f and g below.
Pani-rosa [81]

Answer:

D

Step-by-step explanation:

f(x) - g(x) = -9x^2 - 7x + 12 - (3x^2 - 4x - 15)  Remove the brackets

f(x) - g(x) = -9x^2 - 7x  + 12 - 3x^2 + 4x + 15

f(x) - g(x) = -9x^2 - 3x^2 - 7x + 4x + 12 + 15

f(x) - g(x) = -12x^2- 3x + 27

Answer D

3 0
4 years ago
Read 2 more answers
Other questions:
  • F(x)=x^2+7x-30<br> Find the intercepts, domain and range
    12·1 answer
  • The current temperature in Smalltown is 20°F. This is 6 degrease less than twice the temperature that it was six hours ago. What
    12·1 answer
  • What is the value of x (10x-20) (6x+8)
    9·2 answers
  • Convert 50 marks into 10
    13·1 answer
  • What is the GCF of 44j^5k^4 and 121j^2k^6?
    12·2 answers
  • Someone help me out thx:(
    15·1 answer
  • Martina read that the average graduate student is 33 years old. She wanted to estimate the mean age of graduate students at her
    10·1 answer
  • A video rental store charges a $20 membership fee and $2.50 for each video rented. Find the slope and y-intercept for the data.
    13·2 answers
  • Carmen types at a rate of 16 words per minute. How many words does she type in 4 minutes?
    9·1 answer
  • PLEASE HELP please give explanation and maybe some extra notes i would apperiate :) oop didnt spell that right but oh well anywa
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!