The equation is
on
.

Apply zero product property.
\
and
.
\
Solve the equation
.
The general solution of
, then
.
Where
.
Substitute
in
.
.
Substitute
in
.
.
Solution for
in the interval
, then
.
Solve the equation
.

The general solution of
, then
.
Where
.
Substitute
in
.
.
Substitute
in
.
.
Solution for
in the interval
, then
.
Solution set is
.
\
.