tan

<?

$num = deg2rad(360);

$return = tan($num);

echo $return;

-2.4492935982947E-16

<?

for($i = 0; $i <= 360; ++$i)
{
    $num = deg2rad($i);

    $return = tan($num);

    echo "$i: $return" . PHP_EOL;
}

0: 0
1: 0.017455064928218
2: 0.034920769491748
3: 0.052407779283041
4: 0.06992681194351
5: 0.087488663525924
6: 0.10510423526568
7: 0.1227845609029
8: 0.14054083470239
9: 0.15838444032454
10: 0.17632698070846
11: 0.19438030913772
12: 0.21255656167002
13: 0.23086819112556
14: 0.24932800284318
15: 0.26794919243112
16: 0.28674538575881
17: 0.30573068145866
18: 0.32491969623291
19: 0.34432761328967
20: 0.3639702342662
21: 0.38386403503542
22: 0.40402622583516
23: 0.4244748162096
24: 0.44522868530854
25: 0.466307658155
26: 0.48773258856586
27: 0.50952544949443
28: 0.53170943166148
29: 0.55430905145277
30: 0.57735026918963
31: 0.60086061902756
32: 0.62486935190933
33: 0.64940759319751
34: 0.67450851684243
35: 0.70020753820971
36: 0.72654252800536
37: 0.75355405010279
38: 0.78128562650672
39: 0.80978403319501
40: 0.83909963117728
41: 0.86928673781623
42: 0.90040404429784
43: 0.93251508613766
44: 0.96568877480707
45: 1
46: 1.0355303137906
47: 1.0723687100247
48: 1.1106125148292
49: 1.150368407221
50: 1.1917535925942
51: 1.2348971565351
52: 1.2799416321931
53: 1.3270448216204
54: 1.3763819204712
55: 1.4281480067421
56: 1.4825609685127
57: 1.5398649638146
58: 1.6003345290411
59: 1.6642794823505
60: 1.7320508075689
61: 1.8040477552714
62: 1.8807264653463
63: 1.9626105055052
64: 2.0503038415793
65: 2.1445069205096
66: 2.2460367739042
67: 2.3558523658238
68: 2.4750868534163
69: 2.6050890646938
70: 2.7474774194546
71: 2.9042108776758
72: 3.0776835371753
73: 3.2708526184841
74: 3.4874144438409
75: 3.7320508075689
76: 4.0107809335358
77: 4.3314758742842
78: 4.7046301094785
79: 5.1445540159703
80: 5.6712818196177
81: 6.313751514675
82: 7.1153697223842
83: 8.1443464279746
84: 9.5143644542226
85: 11.430052302761
86: 14.300666256712
87: 19.081136687728
88: 28.636253282916
89: 57.289961630759
90: 1.6331239353195E+16
91: -57.28996163076
92: -28.636253282916
93: -19.081136687728
94: -14.300666256712
95: -11.430052302761
96: -9.5143644542226
97: -8.1443464279746
98: -7.1153697223842
99: -6.313751514675
100: -5.6712818196177
101: -5.1445540159703
102: -4.7046301094785
103: -4.3314758742842
104: -4.0107809335358
105: -3.7320508075689
106: -3.4874144438409
107: -3.2708526184841
108: -3.0776835371753
109: -2.9042108776758
110: -2.7474774194546
111: -2.6050890646938
112: -2.4750868534163
113: -2.3558523658238
114: -2.2460367739042
115: -2.1445069205096
116: -2.0503038415793
117: -1.9626105055052
118: -1.8807264653463
119: -1.8040477552714
120: -1.7320508075689
121: -1.6642794823505
122: -1.6003345290411
123: -1.5398649638146
124: -1.4825609685127
125: -1.4281480067421
126: -1.3763819204712
127: -1.3270448216204
128: -1.2799416321931
129: -1.2348971565351
130: -1.1917535925942
131: -1.150368407221
132: -1.1106125148292
133: -1.0723687100247
134: -1.0355303137906
135: -1
136: -0.96568877480707
137: -0.93251508613766
138: -0.90040404429784
139: -0.86928673781623
140: -0.83909963117728
141: -0.80978403319501
142: -0.78128562650672
143: -0.75355405010279
144: -0.72654252800536
145: -0.70020753820971
146: -0.67450851684243
147: -0.64940759319751
148: -0.62486935190933
149: -0.60086061902756
150: -0.57735026918963
151: -0.55430905145277
152: -0.53170943166148
153: -0.50952544949443
154: -0.48773258856586
155: -0.466307658155
156: -0.44522868530854
157: -0.4244748162096
158: -0.40402622583516
159: -0.38386403503542
160: -0.3639702342662
161: -0.34432761328967
162: -0.32491969623291
163: -0.30573068145866
164: -0.28674538575881
165: -0.26794919243112
166: -0.24932800284318
167: -0.23086819112556
168: -0.21255656167002
169: -0.19438030913772
170: -0.17632698070847
171: -0.15838444032454
172: -0.14054083470239
173: -0.1227845609029
174: -0.10510423526568
175: -0.087488663525924
176: -0.069926811943511
177: -0.052407779283042
178: -0.034920769491748
179: -0.017455064928218
180: -1.2246467991474E-16
181: 0.017455064928217
182: 0.034920769491748
183: 0.052407779283041
184: 0.06992681194351
185: 0.087488663525924
186: 0.10510423526568
187: 0.1227845609029
188: 0.14054083470239
189: 0.15838444032454
190: 0.17632698070847
191: 0.19438030913772
192: 0.21255656167002
193: 0.23086819112556
194: 0.24932800284318
195: 0.26794919243112
196: 0.28674538575881
197: 0.30573068145866
198: 0.32491969623291
199: 0.34432761328967
200: 0.3639702342662
201: 0.38386403503542
202: 0.40402622583516
203: 0.4244748162096
204: 0.44522868530854
205: 0.466307658155
206: 0.48773258856586
207: 0.50952544949443
208: 0.53170943166148
209: 0.55430905145277
210: 0.57735026918963
211: 0.60086061902756
212: 0.62486935190933
213: 0.64940759319751
214: 0.67450851684243
215: 0.70020753820971
216: 0.72654252800536
217: 0.75355405010279
218: 0.78128562650672
219: 0.80978403319501
220: 0.83909963117728
221: 0.86928673781623
222: 0.90040404429784
223: 0.93251508613766
224: 0.96568877480707
225: 1
226: 1.0355303137906
227: 1.0723687100247
228: 1.1106125148292
229: 1.150368407221
230: 1.1917535925942
231: 1.2348971565351
232: 1.2799416321931
233: 1.3270448216204
234: 1.3763819204712
235: 1.4281480067421
236: 1.4825609685127
237: 1.5398649638146
238: 1.6003345290411
239: 1.6642794823505
240: 1.7320508075689
241: 1.8040477552714
242: 1.8807264653463
243: 1.9626105055051
244: 2.0503038415793
245: 2.1445069205096
246: 2.2460367739042
247: 2.3558523658238
248: 2.4750868534163
249: 2.6050890646938
250: 2.7474774194546
251: 2.9042108776758
252: 3.0776835371753
253: 3.2708526184841
254: 3.4874144438409
255: 3.7320508075689
256: 4.0107809335358
257: 4.3314758742842
258: 4.7046301094784
259: 5.1445540159703
260: 5.6712818196177
261: 6.313751514675
262: 7.1153697223842
263: 8.1443464279746
264: 9.5143644542225
265: 11.430052302761
266: 14.300666256712
267: 19.081136687728
268: 28.636253282916
269: 57.289961630759
270: 5.4437464510651E+15
271: -57.289961630761
272: -28.636253282916
273: -19.081136687728
274: -14.300666256712
275: -11.430052302761
276: -9.5143644542225
277: -8.1443464279746
278: -7.1153697223842
279: -6.3137515146751
280: -5.6712818196177
281: -5.1445540159703
282: -4.7046301094785
283: -4.3314758742842
284: -4.0107809335358
285: -3.7320508075689
286: -3.4874144438409
287: -3.2708526184841
288: -3.0776835371753
289: -2.9042108776758
290: -2.7474774194546
291: -2.6050890646938
292: -2.4750868534163
293: -2.3558523658238
294: -2.2460367739042
295: -2.1445069205096
296: -2.0503038415793
297: -1.9626105055052
298: -1.8807264653463
299: -1.8040477552714
300: -1.7320508075689
301: -1.6642794823505
302: -1.6003345290411
303: -1.5398649638146
304: -1.4825609685127
305: -1.4281480067421
306: -1.3763819204712
307: -1.3270448216204
308: -1.2799416321931
309: -1.2348971565351
310: -1.1917535925942
311: -1.150368407221
312: -1.1106125148292
313: -1.0723687100247
314: -1.0355303137906
315: -1
316: -0.96568877480707
317: -0.93251508613766
318: -0.90040404429784
319: -0.86928673781623
320: -0.83909963117728
321: -0.80978403319501
322: -0.78128562650672
323: -0.75355405010279
324: -0.72654252800536
325: -0.70020753820971
326: -0.67450851684243
327: -0.64940759319751
328: -0.62486935190933
329: -0.60086061902756
330: -0.57735026918963
331: -0.55430905145277
332: -0.53170943166148
333: -0.50952544949443
334: -0.48773258856586
335: -0.466307658155
336: -0.44522868530854
337: -0.4244748162096
338: -0.40402622583516
339: -0.38386403503542
340: -0.3639702342662
341: -0.34432761328967
342: -0.32491969623291
343: -0.30573068145866
344: -0.28674538575881
345: -0.26794919243112
346: -0.24932800284318
347: -0.23086819112556
348: -0.21255656167002
349: -0.19438030913772
350: -0.17632698070847
351: -0.15838444032454
352: -0.14054083470239
353: -0.12278456090291
354: -0.10510423526568
355: -0.087488663525924
356: -0.069926811943511
357: -0.052407779283041
358: -0.034920769491748
359: -0.017455064928218
360: -2.4492935982947E-16