查看“︁中学生数学用表”︁的源代码

==三角函数公式==
*两角和公式
<math>\sin (x+y) = \sin x \cos y + \cos x \sin y</math>

<math>\cos (x+y) = \cos x \cos y - \sin x \sin y</math>

<math>\tan (x+y) = \frac{\tan x + \tan y}{1-\tan x \tan y}</math>

*两角差公式
<math>\sin (x-y) = \sin x \cos y - \cos x \sin y</math>

<math>\cos (x-y) = \cos x \cos y + \sin x \sin y</math>

<math>\tan (x-y) = \frac{\tan x - \tan y}{1+\tan x \tan y}</math>

*倍角公式
<math>\sin 2x = 2\sin x \cos x</math>

<math>\cos 2x = \cos^2 x - \sin^2 x = 2\cos^2 x-1 =1-2\sin^2 x</math>

<math>\tan 2x = \frac{2\tan x}{1-\tan^2 x}</math>

==三角函数表==

{|class="wikitable"
!角度(度)!!sin!!cos!!tan
|-
|0.0000||0.0000||1.0000||0.0000
|-
|1.0000||0.0175||0.9998||0.0175
|-
|2.0000||0.0349||0.9994||0.0349
|-
|3.0000||0.0523||0.9986||0.0524
|-
|4.0000||0.0698||0.9976||0.0699
|-
|5.0000||0.0872||0.9962||0.0875
|-
|6.0000||0.1045||0.9945||0.1051
|-
|7.0000||0.1219||0.9925||0.1228
|-
|8.0000||0.1392||0.9903||0.1405
|-
|9.0000||0.1564||0.9877||0.1584
|-
|10.0000||0.1736||0.9848||0.1763
|-
|11.0000||0.1908||0.9816||0.1944
|-
|12.0000||0.2079||0.9781||0.2126
|-
|13.0000||0.2250||0.9744||0.2309
|-
|14.0000||0.2419||0.9703||0.2493
|-
|15.0000||0.2588||0.9659||0.2679
|-
|16.0000||0.2756||0.9613||0.2867
|-
|17.0000||0.2924||0.9563||0.3057
|-
|18.0000||0.3090||0.9511||0.3249
|-
|19.0000||0.3256||0.9455||0.3443
|-
|20.0000||0.3420||0.9397||0.3640
|-
|21.0000||0.3584||0.9336||0.3839
|-
|22.0000||0.3746||0.9272||0.4040
|-
|23.0000||0.3907||0.9205||0.4245
|-
|24.0000||0.4067||0.9135||0.4452
|-
|25.0000||0.4226||0.9063||0.4663
|-
|26.0000||0.4384||0.8988||0.4877
|-
|27.0000||0.4540||0.8910||0.5095
|-
|28.0000||0.4695||0.8829||0.5317
|-
|29.0000||0.4848||0.8746||0.5543
|-
|30.0000||0.5000||0.8660||0.5774
|-
|31.0000||0.5150||0.8572||0.6009
|-
|32.0000||0.5299||0.8480||0.6249
|-
|33.0000||0.5446||0.8387||0.6494
|-
|34.0000||0.5592||0.8290||0.6745
|-
|35.0000||0.5736||0.8192||0.7002
|-
|36.0000||0.5878||0.8090||0.7265
|-
|37.0000||0.6018||0.7986||0.7536
|-
|38.0000||0.6157||0.7880||0.7813
|-
|39.0000||0.6293||0.7771||0.8098
|-
|40.0000||0.6428||0.7660||0.8391
|-
|41.0000||0.6561||0.7547||0.8693
|-
|42.0000||0.6691||0.7431||0.9004
|-
|43.0000||0.6820||0.7314||0.9325
|-
|44.0000||0.6947||0.7193||0.9657
|-
|45.0000||0.7071||0.7071||1.0000
|-
|46.0000||0.7193||0.6947||1.0355
|-
|47.0000||0.7314||0.6820||1.0724
|-
|48.0000||0.7431||0.6691||1.1106
|-
|49.0000||0.7547||0.6561||1.1504
|-
|50.0000||0.7660||0.6428||1.1918
|-
|51.0000||0.7771||0.6293||1.2349
|-
|52.0000||0.7880||0.6157||1.2799
|-
|53.0000||0.7986||0.6018||1.3270
|-
|54.0000||0.8090||0.5878||1.3764
|-
|55.0000||0.8192||0.5736||1.4281
|-
|56.0000||0.8290||0.5592||1.4826
|-
|57.0000||0.8387||0.5446||1.5399
|-
|58.0000||0.8480||0.5299||1.6003
|-
|59.0000||0.8572||0.5150||1.6643
|-
|60.0000||0.8660||0.5000||1.7321
|-
|61.0000||0.8746||0.4848||1.8040
|-
|62.0000||0.8829||0.4695||1.8807
|-
|63.0000||0.8910||0.4540||1.9626
|-
|64.0000||0.8988||0.4384||2.0503
|-
|65.0000||0.9063||0.4226||2.1445
|-
|66.0000||0.9135||0.4067||2.2460
|-
|67.0000||0.9205||0.3907||2.3559
|-
|68.0000||0.9272||0.3746||2.4751
|-
|69.0000||0.9336||0.3584||2.6051
|-
|70.0000||0.9397||0.3420||2.7475
|-
|71.0000||0.9455||0.3256||2.9042
|-
|72.0000||0.9511||0.3090||3.0777
|-
|73.0000||0.9563||0.2924||3.2709
|-
|74.0000||0.9613||0.2756||3.4874
|-
|75.0000||0.9659||0.2588||3.7321
|-
|76.0000||0.9703||0.2419||4.0108
|-
|77.0000||0.9744||0.2250||4.3315
|-
|78.0000||0.9781||0.2079||4.7046
|-
|79.0000||0.9816||0.1908||5.1446
|-
|80.0000||0.9848||0.1736||5.6713
|-
|81.0000||0.9877||0.1564||6.3138
|-
|82.0000||0.9903||0.1392||7.1154
|-
|83.0000||0.9925||0.1219||8.1443
|-
|84.0000||0.9945||0.1045||9.5144
|-
|85.0000||0.9962||0.0872||11.4301
|-
|86.0000||0.9976||0.0698||14.3007
|-
|87.0000||0.9986||0.0523||19.0811
|-
|88.0000||0.9994||0.0349||28.6363
|-
|89.0000||0.9998||0.0175||57.2900
|-
|90.0000||1.0000||0.0000||未下定义
|}


[[Category:数学]]