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
pav-90 [236]
3 years ago
7

CosA.cos2A.cos4A=sin8A/8sinA​

Mathematics
1 answer:
alexgriva [62]3 years ago
3 0

I assume you're supposed to establish the identity,

cos(A) cos(2A) cos(4A) = 1/8 sin(8A) / sin(A)

Recall the double angle identity for sine:

sin(2<em>x</em>) = 2 sin(<em>x</em>) cos(<em>x</em>)

Then you have

sin(8A) = 2 sin(4A) cos(4A)

sin(8A) = 4 sin(2A) cos(2A) cos(4A)

sin(8A) = 8 sin(A) cos(A) cos(2A) cos(4A)

==>   sin(8A)/(8 sin(A)) = cos(A) cos(2A) cos(4A)

as required.

You might be interested in
HEEEEEEEEEEEELP <br> HEEEEEEELP
Bingel [31]

Answer:

x < 2

Step-by-step explanation:

We're going to solve this just like we would an equation, but with just one little twist. First, let's add 1/3 to both sides.

5/6x - 1/3 > 1 1/3

5/6x > 1 2/3

First, let's turn 1 2/3 into an improper fraction to make it easier to work with. Multiply the big number by the denominator, then add the numerator.

1 x 3 + 2 = 5

1 2/3 = 5/3

Now, multiply 5/3 by 2/2 to get 6 as the denominator. This works because 2/2 simplifies to 1 and therefore does not change the value of the fraction.

5 x 2 = 10

3 x 2 = 6

5/3 = 10/6

Now divide both sides by 5/6. Because they both have the same denominator, we can cancel the denominator out and just divide 5x/5 and 10/5.

5/6x > 10/6

5x > 10

x > 2

Wait! We don't have the correct answer just yet. Whenever you divide an inequality, you have to flip the inequality sign.

x < 2

Now <em>there's</em> our final answer.

4 0
3 years ago
Evaluate the expression -4 ( n - 6) + m when n = -5 and m = 2? Show your steps
liubo4ka [24]

Answer: -42

Step-by-step explanation:

-4(n-6)+m

and then they give you the values of each

basically what you do is put the value of m into where it shows on the equation as well as the n.

-4(-5-6)+2 and then you should get

-42

4 0
3 years ago
Someone can you help me please
allochka39001 [22]

Answer:

the first one after 3 would be 4. now the numbers that have a four in the tens place, the numbers after that would be the ones that you would add to the leaf part. same as 8.

Example:

4 | 0 5 7

Step-by-step explanation:

6 0
3 years ago
Jamie collected data from her classmates on their favorite make of car. Based on the data collected, if one hundred boys and one
White raven [17]
The correct answer is this one: "B) More girls than boys prefer Dodge over Ford or Chevrolet." Jamie collected data from her classmates on their favorite make of car. Based on the data collected, if one hundred boys and one hundred girls are given their choice of a car then <span>More girls than boys prefer Dodge over Ford or Chevrolet.</span>
6 0
3 years ago
Read 2 more answers
Is the graph increasing , decreasing or constant
Triss [41]

Answer: Constant.

The graph does not have an incline and therefore has a slope of 0. This means that the graph is constant.

3 0
3 years ago
Read 2 more answers
Other questions:
  • A map scale reads 2 inches = 25 miles which distance does 6 inches represent
    10·2 answers
  • This is confusing i dont understand help please
    11·1 answer
  • Please hurry it’s urgent
    10·1 answer
  • Ricco bought bagels for 6 people. He bought enough for
    7·1 answer
  • Find the slope between the give points (-2, 4) and (<br> -8, 10)
    5·1 answer
  • Helpppppp me plzzzzzzzzzz
    6·2 answers
  • A map uses the scale 1.5 cm=25 mi. Two cities
    12·2 answers
  • three corners of a square are (1, 7), (5, 3), and (9, 7). What are the coordinates of the fourth corner of the square?
    13·2 answers
  • Find the measure of the indicated angle <br><br><br> Show work
    12·1 answer
  • Please help!!!!
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!