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fix cos function

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Corwin 2023-10-08 14:23:04 +01:00
parent 539caf7ad9
commit 548dd9ff67
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1 changed files with 3 additions and 10 deletions
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13
agb-fixnum/src/lib.rs
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@ -533,17 +533,10 @@ impl<I: FixedWidthSignedInteger, const N: usize> Num<I, N> {
/// ```
#[must_use]
pub fn cos(self) -> Self {
let one: Self = I::one().into();
let mut x = self;
let four: I = 4.into();
let two: I = 2.into();
let sixteen: I = 16.into();
let nine: I = 9.into();
let forty: I = 40.into();
x -= one / four + (x + one / four).floor();
x *= (x.abs() - one / two) * sixteen;
x += x * (x.abs() - one) * (nine / forty);
x -= num!(0.25) + (x + num!(0.25)).floor();
x *= (x.abs() - num!(0.5)) * num!(16.);
x += x * (x.abs() - num!(1.)) * num!(0.225);
x
}