3 years ago

You are performing CPR on an 8 month old infant and an AED arrives. How would you apply the pads on the infant?

Health

2 answers:

lara [203]3 years ago

8 0

Answer:

Explanation:

one on the center of the babies chest, and other in center of their back

Cerrena [4.2K]3 years ago

8 0

On the center of the infants chest and back

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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:

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