# Math Help - Inverse trigo prob

1. ## Inverse trigo prob

$S = tan^{-1}(1/3)+tan^{-1}(1/5)+tan^{-1}(1/7)+..........+tan^{-1}(1/(2n-1))$

if S is $\pi/4$ find $n$

2. Hello banku12
Originally Posted by banku12
$S = tan^{-1}(1/3)+tan^{-1}(1/5)+tan^{-1}(1/7)+..........+tan^{-1}(1/(2n-1))$

if S is $\pi/4$ find $n$
I think there's a mistake in the question.

The attachment shows an extract from a spreadsheet. None of the sums gives $S$ the value $\pi/4$.