Cofunction恆等式

\(\sin{(\frac{\pi }{2}-x)}=\cos{x}\)

\(\cos{(\frac{\pi }{2}-x)}=\cot{x}\)

\(\tan{(\frac{\pi }{2}-x)}=\csc{x}\)

\(\cot{(\frac{\pi }{2}-x)}=\sin{x}\)

\(\sec{(\frac{\pi }{2}-x)}=\tan{x}\)

\(\csc{(\frac{\pi }{2}-x)}=\sec{x}\)