(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I forgot how to divide this

1.) x^2 + 15 -8x divided by 3 - x

I dont know how to start since 3 has nothing to do with x^2.

The result from the book is 5 - x.

I also dont understand this problem which uses trigonometric identities.

if x = a sin theta then

2.) square rt of a^2 - x^2

= square rt of a^2 - a^2 sin^2 theta

= square rt of a^2 square rt of 1 - sin^2 theta

= a cos theta .

I dont understand why does

square rt of a^2 - a^2 sin^2 theta

= square rt of a^2 square rt of 1 - sin^2 theta ?

2. Relevant equations

3. The attempt at a solution

Thanks in advance.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: A division and a problem

**Physics Forums | Science Articles, Homework Help, Discussion**