Having read sin of pi radians, it seems as though sin is iffy around truncated inputs.
That said, I'm not quite grokking why it's this bad.
Given this org-mode table:
| i | $x_i$ | $sin(x^3)$ | $x^3$ |
|----+--------+---------------+--------------|
| 0 | -0.785 | -8.4426965e-3 | -0.48373663 |
| 1 | -0.549 | -2.8879774e-3 | -0.16546915 |
| 2 | -0.313 | -5.3519292e-4 | -0.030664297 |
| 3 | -0.077 | -7.9680040e-6 | -4.56533e-4 |
| 4 | 0.159 | 7.0156633e-5 | 4.019679e-3 |
| 5 | 0.395 | 1.0756440e-3 | 0.061629875 |
| 6 | 0.631 | 4.3849440e-3 | 0.25123959 |
| 7 | 0.867 | 0.011374316 | 0.65171436 |
| 8 | 1.103 | 0.023418776 | 1.3419197 |
| 9 | 1.339 | 0.041888230 | 2.4007212 |
| 10 | 1.575 | 0.068136908 | 3.9069844 |
#+TBLFM: $2=(-3.14/4)+(0.236*$1)::$3=sin($2^3)::$4=$2^3
The column with sin(x^3) is very far off. I can tell that the x^3 column is roughly what I expect.
To take an example, sin(1.575^3) should be -0.69282 according to my calculator, not 0.06813 as shown by this table.
What am I getting wrong here?
