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]
2 years ago
15

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

Mathematics
1 answer:
alex41 [277]2 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
The sum of 2 times a number and 8 is 7
My name is Ann [436]

Answer:

The number is -1/2

Step-by-step explanation:

Let x be the number

2x+8 = 7

Subtract 8 from each side

2x+8-8 = 7-8

2x = -1

Divide each side by 2

2x/2 =-1/2

x = -1/2

The number is -1/2

8 0
3 years ago
Read 2 more answers
Solve the simultaneous equations by substitution x − y = 8, x + 4y = 13
Evgesh-ka [11]

Answer:

x = 9; y = 1

Step-by-step explanation:

4 0
2 years ago
Divide. Round to the nearest tenth. <br> .16 ÷ .03220
grigory [225]

Answer: Rounded to the nearest tenth is 5

4.96894409 is the exact answer

7 0
2 years ago
Does any body know this?? plss help
slega [8]

sorry ill give points back

it's this tally/nathan?

8 0
3 years ago
Jay has an album that holds 500 hockey cards. Each page of the album holds 5 hockey cards. If 17​% of the album is​ empty, how m
tamaranim1 [39]

Answer: 83

Step-by-step explanation: 17% of 500 is 85. If 17% is empty, that means that you'd take away that 15%. 500 - 85 = 415. If each page holds 5 cards, we need to split those cards up between the pages. 415/5 = 83, so 83 pages will be used.

5 0
3 years ago
Other questions:
  • 6231 rounded to the nearest thousand is. Enter your answer without<br> commas.
    15·1 answer
  • What is the area of this triangle?
    8·1 answer
  • Graph y-5=-2/3(x+9)<br> 50 points !!!
    5·1 answer
  • Tia made a scale drawing of the White House for her history project. The actual length of the building is 168 feet, and its widt
    12·2 answers
  • Find the product of (5.2 · 10-6) and (8 · 103).
    5·1 answer
  • What 4 consecutive integers equal 36
    13·1 answer
  • #15 only please. thanks.
    15·1 answer
  • Neha used 4 bananas and 5 oranges in her fruit salad. Daniel used 7 bananas and 9 oranges. Did Neha and Daniel use the same rati
    10·1 answer
  • I need help pls 1 - 8 thanks
    6·1 answer
  • Using the standard 28/36 guidelines, what is the maximum mortgage payment allowed for someone with an annual salary of $82,175?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!