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grandymaker [24]
2 years ago
12

Which method helps prevent communicable diseases?

Health
2 answers:
stira [4]2 years ago
8 0
A. vaccination education
Anestetic [448]2 years ago
8 0
The answer is:  [A]:  "vaccination education" .
______________________________________________________
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Which of the following activities does NOT improve stability?
Solnce55 [7]
<span>the activity that does NOT improve stability is: A. maintaining narrow base
A wide base support is easier to balance than a narrow base support . Wide base support will provide you with lower center of gravity, (think how it is easier to stand with two legs compared with standing with one leg)</span>
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Painkilling substances produced by the brain are known as
guapka [62]

Answer:

It will be endorphins

Explanation:

any of a group of hormones secreted within the brain and nervous system and having a number of physiological functions. They are peptides which activate the body's opiate receptors, causing an analgesic effect.

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Analyze the vintage cigarette advertisement. How is the tobacco company reaching potential customers? Check all that apply.
Fittoniya [83]

Vintage cigarette advertising companies used to reach customers by- b. affecting people emotionally through holiday connections and e. making tobacco seem wholesome and good.

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JulijaS [17]
B. She is having trouble eating
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Prove sinA*cos2A=1/4sin4A*secA<br>​
kolezko [41]

Answer:

The prove is below

Explanation:

From trigonometric identities:

cos2A=cos(A+A)=cos^2A-sin^2A\\sin2A=sin(A+A)=2sinAcosA\\sin4A=sin(2A+2A)=2sin2Acos2A=2(2sinAcosA)(cos^2A-sin^2A)=4sinAcos^3A-4cosAsin^3A\\secA=\frac{1}{cosA}

Therefore:

\frac{1}{4}sin4AsecA = \frac{1}{4}( 4sinAcos^3A-4cosAsin^3A)\frac{1}{cosA}\\= sinAcos^3A-cosAsin^3A(\frac{1}{cosA} )\\=sinAcos^2-sin^3A\\=sinA(cos^2A-sin^2A)\\But\ cos^2A-sin^2A=cos2A\\Therefore:sinA(cos^2A-sin^2A)=sinAcos2A\\\frac{1}{4}sin^4Acos2A=sinAcos2A

4 0
2 years ago
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