The equation is
and the point is
. \ \
The slope of the tangent line is equal to the derivative of the function at
. \ \
.
Apply logarithm product rule:
. \ \

Apply derivative on each side with respect to
. \ \







.
\ \
Slope at the point
is
. \ \
Substitute
in
. \ \

. \ \
Point-slope form of line equation
. \ \
Substitute point
and slope
in the above equation. \ \
. \ \
Tangent line equation is
.
\ \
Tangent line equation is
.