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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | import { IComplex, IComplexConstructor } from '../internal/complex'; import mask from '../internal/mask'; import getImag from '../methods/getImag'; import getReal from '../methods/getReal'; export default function cos<T extends IComplex> (Complex: IComplexConstructor<T>, z: IComplex | number, i = 0): T { let zReal: number let zImag: number; if (typeof z === 'number') { zReal = z; zImag = i; } else { zReal = getReal(z); zImag = getImag(z); } if (zImag === 0) { const zCos = Math.cos(zReal); return new Complex( zCos, 0, Math.abs(zCos), zCos < 0 ? Math.PI : 0, mask.HAS_ALL ); } if (zReal === 0) { const zCos = Math.cosh(zImag); return new Complex( zCos, 0, Math.abs(zCos), zCos < 0 ? Math.PI : 0, mask.HAS_ALL ); } return new Complex( Math.cos(zReal) * Math.cosh(zImag), Math.sin(zReal) * Math.sinh(zImag), NaN, NaN, mask.HAS_CARTESIAN ); } |