Beautiful Proofs(#2): Area under a sine curve !

So, I read this post on the the area of the sine curve some time ago and in the bottom was this equally amazing comment :

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I find this extremely beautiful because:

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If you still have trouble understanding, follow the blue point in the above gif and hopefully things become clearer.

Have a great day!

Part – I –> Divergence of the Harmonic series

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Beautiful proofs (#1) : Divergence of the harmonic series

The harmonic series are as follows:

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And it has been known since as early as 1350 that this series diverges. Oresme’s proof to it is just so beautiful.

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Now replace ever term in the bracket with the lowest term that is present in it. This will give a lower bound on S1.

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Clearly the lower bound of S1 diverges and therefore S1 also diverges.
But it interesting to note that of divergence is incredibly small: 10 billion terms in the series only adds up to around 23.6 !