Proof Without Words #3

Proof of the identity

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The figure for general n is similar, with n right pyramids, one with an (n-1)-cube of side length xk as its base and height xk for each k=1,….,n.


The derivative of sin is cosine.

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From ‘Proof without words‘ by Roger Nelsen

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By Sidney H. Kung
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By Shirley Wakin

Previous ‘Proof Without Words‘: Part 1 | Part 2

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