Odd and even恆等式

\(\sin{(-x)}=-\sin{x}\)

\(\cos{(-x)}=\cos{x}\)

\(\tan{(-x)}=-\tan{x}\)

\(\csc{(-x)}=-\csc{x}\)

\(\sec{(-x)}=\sec{x}\)

\(\cot{(-x)}=-\cot{x}\)