asin
Description
Syntax
asin( float $num ): float
Parameters
num
The argument to process
Return
The arc sine of num in radians
Examples
1 · num · single
<? $num = sin(deg2rad(360)); $return = asin($num); echo $return;
-2.4492935982947E-16
2 · num · multiple
<? for($i = 0; $i <= 360; ++$i) { $num = sin(deg2rad($i)); $return = asin($num); echo "$i: $return" . PHP_EOL; }
0: 0 1: 0.017453292519943 2: 0.034906585039887 3: 0.05235987755983 4: 0.069813170079773 5: 0.087266462599716 6: 0.10471975511966 7: 0.1221730476396 8: 0.13962634015955 9: 0.15707963267949 10: 0.17453292519943 11: 0.19198621771938 12: 0.20943951023932 13: 0.22689280275926 14: 0.24434609527921 15: 0.26179938779915 16: 0.27925268031909 17: 0.29670597283904 18: 0.31415926535898 19: 0.33161255787892 20: 0.34906585039887 21: 0.36651914291881 22: 0.38397243543875 23: 0.4014257279587 24: 0.41887902047864 25: 0.43633231299858 26: 0.45378560551853 27: 0.47123889803847 28: 0.48869219055841 29: 0.50614548307836 30: 0.5235987755983 31: 0.54105206811824 32: 0.55850536063819 33: 0.57595865315813 34: 0.59341194567807 35: 0.61086523819802 36: 0.62831853071796 37: 0.6457718232379 38: 0.66322511575785 39: 0.68067840827779 40: 0.69813170079773 41: 0.71558499331768 42: 0.73303828583762 43: 0.75049157835756 44: 0.7679448708775 45: 0.78539816339745 46: 0.80285145591739 47: 0.82030474843733 48: 0.83775804095728 49: 0.85521133347722 50: 0.87266462599716 51: 0.89011791851711 52: 0.90757121103705 53: 0.92502450355699 54: 0.94247779607694 55: 0.95993108859688 56: 0.97738438111682 57: 0.99483767363677 58: 1.0122909661567 59: 1.0297442586767 60: 1.0471975511966 61: 1.0646508437165 62: 1.0821041362365 63: 1.0995574287564 64: 1.1170107212764 65: 1.1344640137963 66: 1.1519173063163 67: 1.1693705988362 68: 1.1868238913561 69: 1.2042771838761 70: 1.221730476396 71: 1.239183768916 72: 1.2566370614359 73: 1.2740903539559 74: 1.2915436464758 75: 1.3089969389957 76: 1.3264502315157 77: 1.3439035240356 78: 1.3613568165556 79: 1.3788101090755 80: 1.3962634015955 81: 1.4137166941154 82: 1.4311699866354 83: 1.4486232791553 84: 1.4660765716752 85: 1.4835298641952 86: 1.5009831567151 87: 1.5184364492351 88: 1.535889741755 89: 1.553343034275 90: 1.5707963267949 91: 1.553343034275 92: 1.535889741755 93: 1.5184364492351 94: 1.5009831567151 95: 1.4835298641952 96: 1.4660765716752 97: 1.4486232791553 98: 1.4311699866354 99: 1.4137166941154 100: 1.3962634015955 101: 1.3788101090755 102: 1.3613568165556 103: 1.3439035240356 104: 1.3264502315157 105: 1.3089969389957 106: 1.2915436464758 107: 1.2740903539559 108: 1.2566370614359 109: 1.239183768916 110: 1.221730476396 111: 1.2042771838761 112: 1.1868238913561 113: 1.1693705988362 114: 1.1519173063163 115: 1.1344640137963 116: 1.1170107212764 117: 1.0995574287564 118: 1.0821041362365 119: 1.0646508437165 120: 1.0471975511966 121: 1.0297442586767 122: 1.0122909661567 123: 0.99483767363677 124: 0.97738438111682 125: 0.95993108859688 126: 0.94247779607694 127: 0.92502450355699 128: 0.90757121103705 129: 0.89011791851711 130: 0.87266462599716 131: 0.85521133347722 132: 0.83775804095728 133: 0.82030474843734 134: 0.80285145591739 135: 0.78539816339745 136: 0.76794487087751 137: 0.75049157835756 138: 0.73303828583762 139: 0.71558499331768 140: 0.69813170079773 141: 0.68067840827779 142: 0.66322511575785 143: 0.6457718232379 144: 0.62831853071796 145: 0.61086523819802 146: 0.59341194567807 147: 0.57595865315813 148: 0.55850536063819 149: 0.54105206811824 150: 0.5235987755983 151: 0.50614548307836 152: 0.48869219055841 153: 0.47123889803847 154: 0.45378560551853 155: 0.43633231299858 156: 0.41887902047864 157: 0.4014257279587 158: 0.38397243543875 159: 0.36651914291881 160: 0.34906585039887 161: 0.33161255787892 162: 0.31415926535898 163: 0.29670597283904 164: 0.27925268031909 165: 0.26179938779915 166: 0.24434609527921 167: 0.22689280275926 168: 0.20943951023932 169: 0.19198621771938 170: 0.17453292519943 171: 0.15707963267949 172: 0.13962634015955 173: 0.1221730476396 174: 0.10471975511966 175: 0.087266462599717 176: 0.069813170079773 177: 0.05235987755983 178: 0.034906585039887 179: 0.017453292519943 180: 1.2246467991474E-16 181: -0.017453292519943 182: -0.034906585039887 183: -0.05235987755983 184: -0.069813170079773 185: -0.087266462599716 186: -0.10471975511966 187: -0.1221730476396 188: -0.13962634015955 189: -0.15707963267949 190: -0.17453292519943 191: -0.19198621771938 192: -0.20943951023932 193: -0.22689280275926 194: -0.24434609527921 195: -0.26179938779915 196: -0.27925268031909 197: -0.29670597283904 198: -0.31415926535898 199: -0.33161255787892 200: -0.34906585039887 201: -0.36651914291881 202: -0.38397243543875 203: -0.4014257279587 204: -0.41887902047864 205: -0.43633231299858 206: -0.45378560551853 207: -0.47123889803847 208: -0.48869219055841 209: -0.50614548307836 210: -0.5235987755983 211: -0.54105206811824 212: -0.55850536063819 213: -0.57595865315813 214: -0.59341194567807 215: -0.61086523819801 216: -0.62831853071796 217: -0.6457718232379 218: -0.66322511575784 219: -0.68067840827779 220: -0.69813170079773 221: -0.71558499331768 222: -0.73303828583762 223: -0.75049157835756 224: -0.76794487087751 225: -0.78539816339745 226: -0.80285145591739 227: -0.82030474843733 228: -0.83775804095728 229: -0.85521133347722 230: -0.87266462599716 231: -0.89011791851711 232: -0.90757121103705 233: -0.92502450355699 234: -0.94247779607694 235: -0.95993108859688 236: -0.97738438111682 237: -0.99483767363677 238: -1.0122909661567 239: -1.0297442586767 240: -1.0471975511966 241: -1.0646508437165 242: -1.0821041362365 243: -1.0995574287564 244: -1.1170107212764 245: -1.1344640137963 246: -1.1519173063163 247: -1.1693705988362 248: -1.1868238913561 249: -1.2042771838761 250: -1.221730476396 251: -1.239183768916 252: -1.2566370614359 253: -1.2740903539559 254: -1.2915436464758 255: -1.3089969389957 256: -1.3264502315157 257: -1.3439035240356 258: -1.3613568165556 259: -1.3788101090755 260: -1.3962634015955 261: -1.4137166941154 262: -1.4311699866353 263: -1.4486232791553 264: -1.4660765716752 265: -1.4835298641952 266: -1.5009831567151 267: -1.5184364492351 268: -1.535889741755 269: -1.553343034275 270: -1.5707963267949 271: -1.553343034275 272: -1.535889741755 273: -1.5184364492351 274: -1.5009831567151 275: -1.4835298641952 276: -1.4660765716752 277: -1.4486232791553 278: -1.4311699866354 279: -1.4137166941154 280: -1.3962634015955 281: -1.3788101090755 282: -1.3613568165556 283: -1.3439035240356 284: -1.3264502315157 285: -1.3089969389957 286: -1.2915436464758 287: -1.2740903539559 288: -1.2566370614359 289: -1.239183768916 290: -1.221730476396 291: -1.2042771838761 292: -1.1868238913561 293: -1.1693705988362 294: -1.1519173063163 295: -1.1344640137963 296: -1.1170107212764 297: -1.0995574287564 298: -1.0821041362365 299: -1.0646508437165 300: -1.0471975511966 301: -1.0297442586767 302: -1.0122909661567 303: -0.99483767363677 304: -0.97738438111682 305: -0.95993108859688 306: -0.94247779607694 307: -0.925024503557 308: -0.90757121103705 309: -0.89011791851711 310: -0.87266462599716 311: -0.85521133347722 312: -0.83775804095728 313: -0.82030474843733 314: -0.80285145591739 315: -0.78539816339745 316: -0.76794487087751 317: -0.75049157835756 318: -0.73303828583762 319: -0.71558499331768 320: -0.69813170079773 321: -0.68067840827779 322: -0.66322511575785 323: -0.6457718232379 324: -0.62831853071796 325: -0.61086523819802 326: -0.59341194567807 327: -0.57595865315813 328: -0.55850536063819 329: -0.54105206811824 330: -0.5235987755983 331: -0.50614548307836 332: -0.48869219055841 333: -0.47123889803847 334: -0.45378560551853 335: -0.43633231299858 336: -0.41887902047864 337: -0.4014257279587 338: -0.38397243543875 339: -0.36651914291881 340: -0.34906585039887 341: -0.33161255787892 342: -0.31415926535898 343: -0.29670597283904 344: -0.27925268031909 345: -0.26179938779915 346: -0.24434609527921 347: -0.22689280275926 348: -0.20943951023932 349: -0.19198621771938 350: -0.17453292519943 351: -0.15707963267949 352: -0.13962634015955 353: -0.1221730476396 354: -0.10471975511966 355: -0.087266462599717 356: -0.069813170079774 357: -0.05235987755983 358: -0.034906585039886 359: -0.017453292519943 360: -2.4492935982947E-16