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rosijanka [135]
3 years ago
14

How to find cos2theta

Mathematics
2 answers:
horrorfan [7]3 years ago
8 0
These are the double angle formulas. What the other person mentioned above is the sum and difference formula.

SSSSS [86.1K]3 years ago
5 0
You can use the sum and difference identities which for cosine is cos(a+b)= cosacosb-sinasinb
You might be interested in
(-1,-6) and (-3,-8) y=Mx+b
denpristay [2]

Answer:

m = 1, b = -5         y = x -5

Step-by-step explanation:

first find the slope or m

slope is change in y over change in x

-8 - (-6) = -2

-3 - (-1) = -2

-2/-2 = 1

m = 1

y = x + b

use one of the points and solve for b

7 0
3 years ago
A puppy store has a puppy that weighs 72 ounces how many pounds does it weigh 1 pound = 16 ounces
tresset_1 [31]

4.5 pounds

72 ounces


HOW-TO:

1. we know that 1 pound is 16 ounces.

So let's find how many of 16 are needed for 72.

72 ÷ 16 = 4.5

Use that answer and multiply it by the number of pounds per 16 ounces.

You get 4.5 pounds.

4 0
3 years ago
Factorise -75ab² - 15ac
Verdich [7]

Answer:

1)  -15·a·(5·b² + c)

2) h < 4

3) 4·x² - 9

4) 1792

5)  156°

6) 2t cm

7) 2·a·m·(2·m - 3)

8)  10 cm

9) 0.00051

10)  #47,250

11)  -10·p·q

12) 1.35 × 10⁻⁴

13) 320°

14) 20 cm

15) 12·x²·y²

16) 6.36 × 10⁵

17) 4 cm

18)  225°

19) 1034 cm²

20) 29

Step-by-step explanation:

1) The given expression is -75·a·b - 15·a·c

Which can be expressed as -15·a·(5·b² + c)

2) The height, h < 2 × 12/6 = 4

h < 4

3) (2·x - 3)·(2·x + 3) = 4·x² - 9

4) The selling price = 1.12 × 200 × 8 = 1792

5) The interior angle of a polygon is given by the relation;

(n - 2)×180/n for 15, we get;

(15 - 2)×180/15 = 156°

6) 2t cm

7) 4·a·m² - 6·a·m = 2·a·m·(2·m - 3)

8) Slant height = √(8² + 6²) = 10 cm

9) 51 × 10⁻⁵ = 0.00051

10) Cash price = #54,000 × (1 - 0.125) = #47,250

11) -40·p·q÷(-2)² = -10·p·q

12) 0.003 × 0.045 = 1.35 × 10⁻⁴

13) N40°W = 320°

14) The base diameter of the cylinder = √(4 × (700×π cm³/7)/π) = 20 cm

15) The LCM of 2·x²·y, 3·x·y² is 12·x²·y²

16) 636,000 = 6.36 × 10⁵

17) 1/3·π·r²·h₁ = π·r²·h₂

h₂/h₁ = 1/3·π·r²/( π·r²) = 1/3

h₂/12 =  1/3

h₂ = 12/3 = 4 cm, the height of the cylinder = 4 cm

18) The angle = 180 + 45 = 225°

19) The total surface area = 22/7×14²/4 +  22/7 ×14 × 20 = 1034 cm²

20) The number is 58/2 = 29.

4 0
3 years ago
Imagine that these are test scores on a Statistics examinations (test):
yanalaym [24]

Answer:

a

Step-by-step explanation:

7 0
3 years ago
Please please please help
Goshia [24]

answer

ITS C

Step-by-step explanation:

BECAUSE OF THE ROOT THAT THEY CAMPARE

3 0
2 years ago
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