The amplitude of the function is
and period is
.
The phaseshift of the function is
.
Find the equation of a sine function.
\The general form of sine function is
.
Where the amplitude is
,period is
and phaseshift is
.
The amplitude is 
The period is
.


.
Phaseshift is
.


Substitute
,
and
in
.
.
Therefore, the equation of the sine function is
.
The equation of the sine function is
.