c programming: computing sine using triple-angle formula
* image taken from list of trigonometric identities at Wikipedia. * simplify above equation to make our life easier, we get
from above equation we can now solve sin(x).
here's a simple solution using recursive loop until angle reach zero value
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double cube (double x) {
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return x*x*x;
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}
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double sine (double angle) {
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if (angle < 0.00000001) { return angle; }
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return 3*(sine (angle/3.0)) - 4*cube(sine (angle/3.0));
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}
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int main() {
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return 0;
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}
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the output is: 0.826880
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