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olya-2409 [2.1K]
3 years ago
11

Three friends buy one pack of 80 stickers. T hey divide the stickers equally and give the remainder to their teacher. How many w

ill each friend get?
Mathematics
1 answer:
Anestetic [448]3 years ago
8 0

Answer:

26

Step-by-step explanation:

80 divided by three = 26.666666

26 times 3 = 78

2 leftover

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Why is the answer to this integral's denominator have 1+pi^2
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It comes from integrating by parts twice. Let

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u = \sin(\pi n) \implies du = \pi \cos(\pi n) \, dn

dv = e^n \, dn \implies v = e^n

Then

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Apply IBP once more, with

u = \cos(\pi n) \implies du = -\pi \sin(\pi n) \, dn

dv = e^n \, dn \implies v = e^n

Notice that the ∫ v du term contains the original integral, so that

\displaystyle I = e^n \sin(\pi n) - \pi \left(e^n \cos(\pi n) + \pi \int e^n \sin(\pi n) \, dn\right)

\displaystyle I = \left(\sin(\pi n) - \pi \cos(\pi n)\right) e^n - \pi^2 I

\displaystyle (1 + \pi^2) I = \left(\sin(\pi n) - \pi \cos(\pi n)\right) e^n

\implies \displaystyle I = \frac{\left(\sin(\pi n) - \pi \cos(\pi n)\right) e^n}{1+\pi^2} + C

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Answer:

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Step-by-step explanation:

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2. Solve each equation separately

(a) Equation (1)

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