四個象限的三角比
\(\sin \theta\) \(\cos \theta\) \(\tan \theta\)
\(\sin (180 ° -\theta)\) \(\cos (180 ° -\theta)\) \(\tan (180 ° -\theta)\)
\(\sin (180 ° +\theta)\) \(\cos (180 ° +\theta)\) \(\tan (180 ° +\theta)\)
\(\sin (360 ° -\theta)\) \(\cos (360 ° -\theta)\) \(\tan (360 ° -\theta)\)