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d29871977f
We already have a LICENSE file that covers the Zig Standard Library. We no longer need to remind everyone that the license is MIT in every single file. Previously this was introduced to clarify the situation for a fork of Zig that made Zig's LICENSE file harder to find, and replaced it with their own license that required annual payments to their company. However that fork now appears to be dead. So there is no need to reinforce the copyright notice in every single file.
23 lines
584 B
Zig
23 lines
584 B
Zig
const std = @import("../../std.zig");
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const testing = std.testing;
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const math = std.math;
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const cmath = math.complex;
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const Complex = cmath.Complex;
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/// Returns the cosine of z.
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pub fn cos(z: anytype) Complex(@TypeOf(z.re)) {
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const T = @TypeOf(z.re);
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const p = Complex(T).init(-z.im, z.re);
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return cmath.cosh(p);
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}
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const epsilon = 0.0001;
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test "complex.ccos" {
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const a = Complex(f32).init(5, 3);
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const c = cos(a);
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try testing.expect(math.approxEqAbs(f32, c.re, 2.855815, epsilon));
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try testing.expect(math.approxEqAbs(f32, c.im, 9.606383, epsilon));
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}
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