三角函数的值:
sin0=sin0°=0
cos0=cos0°=1
tan0=tan0°=0
sin15=0.650sin15°=（√6-√2）/4
cos15=-0.759cos15°=（√6+√2）/4
tan15=-0.855tan15°=2-√3
sin30=-0.988sin30°=1/2
cos30=0.154cos30°=√3/2
tan30=-6.405tan30°=√3/3
sin45=0.851sin45°=√2/2
cos45=0.525cos45°=sin45°=√2/2
tan45=1.620tan45°=1
sin60=-0.305sin60°=√3/2
cos60=-0.952cos60°=1/2
tan60=0.320tan60°=√3
sin75=-0.388sin75°=cos15°
cos75=0.922cos75°=sin15°
tan75=-0.421tan75°=sin75°/cos75° =2+√3
sin90=0.894sin90°=cos0°=1
cos90=-0.448cos90°=sin0°=0
tan90=-1.995tan90°不存在
sin105=-0.971sin105°=cos15°
cos105=-0.241cos105°=-sin15°
tan105=4.028tan105°=-cot15°
sin120=0.581sin120°=cos30°
cos120=0.814cos120°=-sin30°
tan120=0.713tan120°=-tan60°
sin135=0.088sin135°=sin45°
cos135=-0.996cos135°=-cos45°
tan135=-0.0887tan135°=-tan45°
sin150=-0.7149sin150°=sin30°
cos150=-0.699cos150°=-cos30°
tan150=-1.022tan150°=-tan30°
sin165=0.998sin165°=sin15°
cos165=-0.066cos165°=-cos15°
tan165=-15.041tan165°=-tan15°
sin180=-0.801sin180°=sin0°=0
cos180
