# Math Help - trig prove

1. ## trig prove

$cosecA+cosec2A+cosec4A=cot\frac{A}{4}-cot4A$

2. ## Re: trig prove

Originally Posted by srirahulan
$cosecA+cosec2A+cosec4A=cot\frac{A}{4}-cot4A$
This is not true in general. Try, for example, $A=\frac\pi3$.