# Math Help - derivative help

1. ## derivative help

$
y=cot\sqrt{x}
$

$
= -csc^2x(x)^\frac{1}{2}-\frac{1}{2}x^\frac{-1}{2}
$

corrrecT?

2. Originally Posted by jvignacio
$
y=cot\sqrt{x}
$

$
= -csc^2{\color{red}x}(x)^\frac{1}{2}{\color{red}-}\frac{1}{2}x^\frac{-1}{2}
$

corrrecT?
The x in red is not necessary, and the - sign shouldn't be there. You end up multiplying those terms together, not subtracting them!

--Chris