3 years ago

If cos B = 3/5 , then what is the positive value of cos 1/2 B , in simplest radical form with a rational denominator?

Mathematics

1 answer:

ahrayia [7]3 years ago

5 0

Answer:

cos(B/2) = 2√5 / 5

Step-by-step explanation:

Use half angle formula:

cos²(B/2) = (1 + cos B) / 2

cos²(B/2) = (1 + 3/5) / 2

cos²(B/2) = (8/5) / 2

cos²(B/2) = 4/5

cos(B/2) = 2/√5

cos(B/2) = 2√5 / 5

You might be interested in

PLEASE ANSWER ASAP WITH WORK FOR BRAINLEST!!!!!!!!!!!!!!!!

-BARSIC- [3]

First divide both sides by 12 so u get 5x -4.5 = 3. Now add 4.5 to both sides and u get 5x = 7.5. Now divide 7.5 by 5 and u get 1.5

6 0

2 years ago

If Martina pays $40000 per month,each month $680 in federal income tax ,$160 in state income tax ,and $79 in other taxes what is

Brut [27]

I believe the answer is $39,081

5 0

2 years ago

Solve each equation. Type only the number solution, without x =

ra1l [238]

1. X = 14
2. X = 120
3. X = 9.24
4. X = 16
5. X = 193.6
6. X = 11
7. X = 7.8
8. X = 446.4
9. X = 26.25
10. X = 6.6
11. X = 9
12. X = 2.01

4 0

2 years ago

Read 2 more answers

Divide 30 in a ratio of 3:2

pogonyaev

3+2=5
30 divided by 5=6
6X3=18
6X2=12
18+12=30
18:12

5 0

3 years ago

Read 2 more answers

HELP ASAP! Will name brainliest!

gogolik [260]

Answer:

The answer to your question is given in the attached photo.

Step-by-step explanation:

To determine the answer to the question,

First, we shall determine the value 3A.

This is obtained by multiplying matrix A by 3 as shown in the attached photo.

Next, we shall carry out the operation 3A – B as shown in the attached photo.

5 0

3 years ago