Drexel dragonThe Math ForumDonate to the Math Forum

Ask Dr. Math - Questions and Answers from our Archives
_____________________________________________
Associated Topics || Dr. Math Home || Search Dr. Math
_____________________________________________

Simplify Numerator and Denominator


Date: 4/15/96 at 21:15:5
From: "Scott A. Mehring"
Subject: Derivatives of sines and cosines

What is the algebra, or actually the trig, that lets you go from 

	-sin x + 1
	-----------
	(1- sin x)^2

to
	1
	-----
	1-sin x

You take one -sin x from the top out of the den, but how is it 
done in a step-by-step process?  

Thank you.



Date: 4/17/96 at 11:14:36
From: Doctor Sebastien
Subject: Re: Derivatives of sines and cosines

Hello,

Well, that's simply a question of looking at things from 
another angle.

 -sin x + 1
-------------
(1 - sin x)^2 

    1 - sin x
= -------------
  (1 - sin x)^2

      1
= -----------
  (1 - sin x)

-Doctor Sebastien,  The Math Forum

    
Associated Topics:
High School Trigonometry

Search the Dr. Math Library:


Find items containing (put spaces between keywords):
 
Click only once for faster results:

[ Choose "whole words" when searching for a word like age.]

all keywords, in any order at least one, that exact phrase
parts of words whole words

Submit your own question to Dr. Math

[Privacy Policy] [Terms of Use]

_____________________________________
Math Forum Home || Math Library || Quick Reference || Math Forum Search
_____________________________________

Ask Dr. MathTM
© 1994-2013 The Math Forum
http://mathforum.org/dr.math/