対称性
\(\sin\left(-\theta\right)\)
\(\cos\left(-\theta\right)\)
\(\tan\left(-\theta\right)\)

対称性
\(\sin\left(\theta+\pi\right)\)
\(\cos\left(\theta+\pi\right)\)
\(\tan\left(\theta+\pi\right)\)

対称性　(垂直条件)
\(\sin\left(\theta+\dfrac{\pi}{2}\right)\)
\(\cos\left(\theta+\dfrac{\pi}{2}\right)\)
\(\tan\left(\theta+\dfrac{\pi}{2}\right)\)

対称性　(垂直条件)
\(\sin\left(\theta-\dfrac{\pi}{2}\right)\)
\(\cos\left(\theta-\dfrac{\pi}{2}\right)\)
\(\tan\left(\theta-\dfrac{\pi}{2}\right)\)

\(\sin\left(\theta+\dfrac{\pi}{6}\right)\)
\(\cos\left(\theta-\dfrac{\pi}{3}\right)\)
\(\tan\left(\theta+\dfrac{\pi}{4}\right)\)
など，どうなるのだろうか？