Observe the figure.
\Tthe length of opposite side to
is
.
The length of adjacent side to
is
.
The length of the hypotenuse is
.
The trigonometric function :
.
.
The trigonometric function :
.
.
The trigonometric function :
.
.
The trigonometric function :
.
.
The trigonometric function :
.
.
The trigonometric function :
.
.
.
.
.
.
.
.