The trigonometric function
.

opposite side = 4 and adjacent side = 5.
\The right triangle diagram is
\
Now find the hypotenuse by using Pythagorean theorem.
\Pythagorean theorem :
.



Take square root each side
\
Opposite side =
.
,
,
,
, and
.
The values of the trigonometric functions are
,
,
,
, and
.