Consider `f(x)=tan^(-1)(sqrt((1+sinx)/(1-sinx))), x in (0,pi/2)dot`
A normal to `y=f(x)`
at `x=pi/6`
also passes through the point:
(1) (0, 0)
(2) `(0,(2pi)/3)`
(3) `(pi/6,0)`
(4) `(pi/4,0)`
A. `(0,(2pi)/(3))`
B. `((pi)/(6),0)`
C. `((pi)/(4),0)`
D. `(0,0)`
