1 year ago

If cos8x = 13/36 find the value of cos4x.

Mathematics

1 answer:

Elina [12.6K]1 year ago

3 0

The value of cos 4x from the given identity is 0.999

<h3>Trigonometry identity</h3>

Given the cosine identity

cos8x = 13/36

Determine the value of x

8x = arccos(13/36)
8x = 0.36111

x = 0.36111/8
x = 0.04514

Determine the value of cos4x

cos4x = cos4(0.04514)

cos4(0.04514) = 0.999

Hence the value of cos 4x from the given identity is 0.999

Learn more trig identity here; brainly.com/question/7331447

You might be interested in

I have no idea how to do 8

Ira Lisetskai [31]

You need to expand the brackets on both sides and then you can break it down

3 0

2 years ago

Using a rule why is = to 3 x + 4 find the value of y when x is 2

Alex73 [517]

X=2 so 2+4=6 so y=6. I just gone ovee this unit aswell.

4 0

3 years ago

of the 273 students in a school, 95 volunteered to work the book sale. About what percent of the students volunteered?

Whitepunk [10]

28.7% to b exact
I hope this helped you

6 0

3 years ago

What is the relationship between the ratios? 5/8 and 8/10 Drag and drop to complete the statement.

Lubov Fominskaja [6]

Answer:

NOT PROPORTIONAL

Step-by-step explanation:

The given two fractions are: $\frac{5}{8}$ and $\frac{8}{10}$ .

Proportional fractions are those which have the same value when to reduced to the simplest form.

Consider two fractions $\frac{p}{q}$ and $\frac{x}{y}$ .

We say they are proportional if $p : q = x : y$ .

Or, if $py = qx$ then we can say the fractions are proportional.

Here the fractions are: $\frac{5}{8}$ and $\frac{8}{10}$ .

LHS: 5 X 10 = 50.

RHS: 8 X 8 = 64.

Clearly they are not equal. So, we can say these two fractions are not proportional.

6 0

3 years ago

Drag and drop the words below to correctly complete the statement of the SAS Similarity Theorem.

Olegator [25]

Congruent
An angle
Sides
Proportional
Similar

5 0

2 years ago

If cos8x = 13/36 find the value of cos4x.​

If cos8x = 13/36 find the value of cos4x.