Sec(θ)

Định Nghỉa

Sec(θ) = 1 trên Cạnh Kề

Sec(θ) = $\frac{1}{X} = \frac{1}{cos \theta}$

300

Sec(θ)

θ	R	X	Y	Sin(θ)
30ο	1	$\frac {1}{2}$	$\frac {\sqrt{3}} {2}$	$\frac {\sqrt{3}} {2}$
45ο	1	$\frac {1}{\sqrt{2}}$	$\frac {1}{\sqrt{2}}$	$\frac {1}{\sqrt{2}}$
60ο	1	$\frac {\sqrt{3}} {2}$	$\frac {1}{2}$	$\frac {1}{2}$
90ο	1	0	1	1