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This is Numberphile. We mainly post videos about mathematics and just numbers in general.

A Surprising Pi and 5

A Surprising Pi and 5

Additional information

Ben Sparks discusses 5 and Pi.

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More Numberphile videos with Ben Sparks: http://bit.ly/Sparks_Playlist

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Beautiful Trigonometry

Beautiful Trigonometry

PODCAST: The Happy Twin - with Ben Sparks

PODCAST: The Happy Twin - with Ben Sparks