# [SOLVED] Simplifying where am I going wrong?

• Mar 10th 2009, 06:05 PM
TYTY
[SOLVED] Simplifying where am I going wrong?
$

(\sqrt{5}sin(\theta))^3\sqrt{5 - (\sqrt{5}sin(\theta))^2}\sqrt{5}cos(\theta)

$

$
= 25sin^3(\theta)(\sqrt{5cos^2(\theta)}\sqrt{5}cos(\ theta)

$

$
= 25sin^3(\theta)\sqrt{5}cos(\theta)\sqrt{5}cos(\the ta)

$

$
= 25sin^3(\theta)5cos^2(\theta)
$

$
= 125sin^3(\theta)cos^2(\theta)
$

this is slightly off from what the book has but it provides no explanation
• Mar 10th 2009, 06:07 PM
TYTY
oh I think I just noticed it. the 25 should be $5\sqrt{5}$