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What is the easiest to submit complex material

So the question is: what is the difference between harmonic and sinusoidal oscillations?

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Here - calculation for engineers:



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Collection knives bought from a priest (!)
...
Studying at universities in Poland: what documents should be submitted?
...
How to properly insulate the bath with your own hands
...
The fence of the slab: build with your own hands
...
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Phone jokes.
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The 8 most popular natural insulation for your home - save on heating
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7 unique old recipes of Sokolnikov
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 Transparent lair for cats  The priest absolution