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geniusboy [140]
3 years ago
10

The photo is attached

Mathematics
1 answer:
aleksley [76]3 years ago
7 0

D

using the double - angle identity

cos (2A) = cos² A - sin² A = 2cos² A - 1 = 1 - 2sin² A

the right side = 1 - 2sin² (112.5° ) with A = 22.5°

hence 2A = 2 × 22.5° = 45°

thus cos 45° = 1 - 2sin² ( 22.5°)


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drek231 [11]
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6 0
3 years ago
If there are 12 crayons in each box, how many crayons are<br> there in 1 1/2 boxes?
ipn [44]
There are 18 crayons


Explanation:
1 whole = 12 crayon
1/2 of 12 is 6
12+6=18
4 0
2 years ago
I need help plz! ( Thank u )
devlian [24]

y/3 = h

Multiply both sides by 3:

y = 3h


4 0
3 years ago
There are 26 students in tour class. There are 4 more girls than boys. Use a system of linear equations to find how many boys ar
puteri [66]
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5 0
4 years ago
| 2p -1 | =45, what are the values of p?
Alex73 [517]

Answer:

p = 23       and p = -22

Step-by-step explanation:

| 2p -1 | =45

Absolute value equations have 2 solutions, one positive value and one negative

2p-1 = 45    and 2p-1 = -45

Add 1 to all sides

2p-1+1 = 45+1    and 2p-1+1 = -45+1

2p = 46                        2p = -44

Divide by 2

2p/2 = 46/2    and   2p/2  = -44/2

p = 23       and p = -22

5 0
3 years ago
Read 2 more answers
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