# Inverse trigo prob

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• May 3rd 2010, 03:53 AM
banku12
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 $n$
• May 3rd 2010, 10:31 PM
Grandad
Hello banku12
Quote:

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 $\pi/4$.

Grandad