What is the equation of the line normal to $f(x)=xtanx$ at $x=pi/2$ ?

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Answer 1 · 2016-05-06T21:31:37

There is no such thing.

$pi/2$ is not in the domain of $tanx$ , so it is not in the domain of $f$ .

There is no point on the graph with $x=pi/2$ , so there is no line normal to the graph at $x=pi/2$ .

What is the equation of the line normal to f(x)=xtanx f(x)=xtanx at x=pi/2 x=pi/2?