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3 years ago

La oración 3+ (5 + 2) = (5 + 2) +3 muestra qué propiedad?

Mathematics

1 answer:

Flauer [41]3 years ago

4 0

The expression represents commutative property of addition

Hope this helps

-AaronWiseIsBae

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The perimeter of a rectangular parking lot is 292 m.

Reika [66]

Answer:

the answer would be 211

Step-by-step explanation:

you simply add the length and width together to find perimeter. since you have the total perimeter and the length you would instead subtract the two.

292-81= 211

4 0

3 years ago

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Derive these identities using the addition or subtraction formulas for sine or cosine: sinacosb=(sin(a+b)+sin(a-b))/2

Sergeu [11.5K]

Answer:

The work is in the explanation.

Step-by-step explanation:

The sine addition identity is:

$\sin(a+b)=\sin(a)\cos(b)+\cos(a)\sin(b)$ .

The sine difference identity is:

$\sin(a-b)=\sin(a)\cos(b)-\cos(a)\sin(a)$ .

The cosine addition identity is:

$\cos(a+b)=\cos(a)\cos(b)-\sin(a)\sin(b)$ .

The cosine difference identity is:

$\cos(a-b)=\cos(a)\cos(b)+\sin(a)\sin(b)$ .

We need to find a way to put some or all of these together to get:

$\sin(a)\cos(b)=\frac{\sin(a+b)+\sin(a-b)}{2}$ .

So I do notice on the right hand side the $\sin(a+b)$ and the $\sin(a-b)$ .

Let's start there then.

There is a plus sign in between them so let's add those together:

$\sin(a+b)+\sin(a-b)$

$=[\sin(a+b)]+[\sin(a-b)]$

$=[\sin(a)\cos(b)+\cos(a)\sin(b)]+[\sin(a)\cos(b)-\cos(a)\sin(b)]$

There are two pairs of like terms. I will gather them together so you can see it more clearly:

$=[\sin(a)\cos(b)+\sin(a)\cos(b)]+[\cos(a)\sin(b)-\cos(a)\sin(b)]$

$=2\sin(a)\cos(b)+0$

$=2\sin(a)\cos(b)$

So this implies:

$\sin(a+b)+\sin(a-b)=2\sin(a)\cos(b)$

Divide both sides by 2:

$\frac{\sin(a+b)+\sin(a-b)}{2}=\sin(a)\cos(b)$

By the symmetric property we can write:

$\sin(a)\cos(b)=\frac{\sin(a+b)+\sin(a-b)}{2}$

3 0

3 years ago

Help please hurry im stupid :'( will mark brainlyest

bixtya [17]

19.) Least to greatest:
Luxembourg
Singapore
Australia
Egypt
Brazil

5 0

3 years ago

(Please help with this, I'm in the middle of a quiz)

astraxan [27]

Answer:

D)16 ft (feet)

Step-by-step explanation:

20x24=256ft

Then you square root that and get 16.

Hope this helps.

6 0

3 years ago

11 ounces to 5 ounces

harkovskaia [24]

Answer: what is the question to this?

Step-by-step explanation: thanks let me know okay

4 0

4 years ago

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