Given an input vector and position (which is zero based) output the value
x = [1 2; 4 5] pos = [0 1] value = 5
x = [1 2 3 4 5; 6 7 8 9 0] pos = [1 3] value = 9
Determine the square root
2倍してみよう - ここからスタート！
Matrix of almost all zeros, except for main diagonal
Some tweaks in summation, Can you decode? :)
Create tangent function out of cosine only
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