# What is the equation of the line normal to # f(x)=xtanx# at # x=pi/3#?

##### 1 Answer

#### Explanation:

Let us find the slope of the tangent, which should give us slope of normal (as it is perpendicular to tangent and hence product of their slopes would be

Slope of tangent is given by first derivative and this is

=

and slope of normal is

As normal is needed at

Hence, using point slope form of equation

Equation of normal is