The curve equation is
and the point is
.
The slope of the tangent line is equal to the derivative of the function at
.
Apply derivative on each side with respect to
.
.
Derivative of constants:
.
.
Derivative of inverse trigonometric function:
.

The slope of the tangent line is
.
Substitute
in above equation.
.
Slope of the tangent line is
.
Point-slope form of line equation is
.
Substitute
and
in the above equation.


The equation of the tangent line is
.
The equation of the tangent line is
.