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| 1 // Copyright 2009 The Go Authors. All rights reserved. | 1 // Copyright 2009 The Go Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style | 2 // Use of this source code is governed by a BSD-style |
| 3 // license that can be found in the LICENSE file. | 3 // license that can be found in the LICENSE file. |
| 4 | 4 |
| 5 package math | 5 package math |
| 6 | 6 |
| 7 | |
| 8 /* | 7 /* |
| 9 Floating-point arcsine and arccosine. | 8 Floating-point arcsine and arccosine. |
| 10 | 9 |
| 11 They are implemented by computing the arctangent | 10 They are implemented by computing the arctangent |
| 12 after appropriate range reduction. | 11 after appropriate range reduction. |
| 13 */ | 12 */ |
| 14 | 13 |
| 15 // Asin returns the arcsine of x. | 14 // Asin returns the arcsine of x. |
| 16 // | 15 // |
| 17 // Special cases are: | 16 // Special cases are: |
| (...skipping 23 matching lines...) Expand all Loading... |
| 41 temp = -temp | 40 temp = -temp |
| 42 } | 41 } |
| 43 return temp | 42 return temp |
| 44 } | 43 } |
| 45 | 44 |
| 46 // Acos returns the arccosine of x. | 45 // Acos returns the arccosine of x. |
| 47 // | 46 // |
| 48 // Special case is: | 47 // Special case is: |
| 49 // Acos(x) = NaN if x < -1 or x > 1 | 48 // Acos(x) = NaN if x < -1 or x > 1 |
| 50 func Acos(x float64) float64 { return Pi/2 - Asin(x) } | 49 func Acos(x float64) float64 { return Pi/2 - Asin(x) } |
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