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gtnhenbr [62]
2 years ago
5

Use an appropriate half-angle formula to find the exact value of the expression. cos(22. 5°)

Mathematics
1 answer:
Sladkaya [172]2 years ago
4 0

The value of given trigonometric value cos(22. 5°) is 0.387.

According to the statement

we have given that the trigonometric value and we have to find the exact value of that given value with the help of the half angle formula.

So, For this purpose, we know that the

The half angle formulas are used to find the exact values of the trigonometric ratios of the angles like 22.5°.

So,

The given value is :

cos(22. 5°)

Then the value of cos half angle formula is

cos (theta/2) = +- sqrt((1-cos theta) / 2)

then

The value of θ/2 is 22.5 degree.

And θ is 22.5*2

θ = 45 degree

and cos 45 degree is 1/squareroot 2

And by this the value of given value become is

cos 22.5 =  +\sqrt{((\sqrt{2}  -1)/(2 \sqrt{2} )) }  = + 0.3827

So, The value of given trigonometric value cos(22. 5°) is 0.387.

Learn more about half angle formulas here

brainly.com/question/12475880

#SPJ4

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HELP<br> 35) Find the measure of line segment WV.<br> A) 3<br> B) 4<br> C) 5<br> D) 6
frozen [14]

Step-by-step explanation:

secants originating from the same point have the same relative length relationship :

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so,

5×(7+5) = 6×(2x-8+6) = 12x - 12

60 = 12x - 12

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8 0
2 years ago
Suppose PV =NRT, where P=8, V=2X, N=2 and R=2X.you are given X=3. Solve for T
FromTheMoon [43]

Answer:  T = 4

Step-by-step explanation:

1. Write all the variables down

P = 8  V = 2X  N = 2  R = 2X  X = 3

2. Since you know that X = 3 substitute it in to find V and R

V = 2X = 2(3) = 6

R = 2X = 2(3) = 6

3. Find PV

PV = P x V

     = 8 x 6

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4. Find NRT

NRT = N x R x T

       = 2 x 6 x T

       = 12 x T

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5. Find T

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48 = 12T

12T = 48

divide both sides by 12

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7 0
3 years ago
A roller coaster has four cars each with the same number of seats. these are 21 passengers seated in the roller coaster, but 3 s
belka [17]

Given:

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To find:

An equation that can be used to determine the number of seats in each car.

Solution:

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Total number of seats in 4 cars = 4s

Using the given information,

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4s=24

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Divide both sides by 4.

s=\dfrac{24}{4}

s=6

Therefore, the number of seats in each car is 6.

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Here, the differing digits are 1 and 0 in the thousandths place. The appropriate sign is ">"

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