+0  
 
+1
25
3
avatar+34 

9/ (1+ cos(x) ) + 9/(1- cos(x) ) 

 

 

I'm not sure how to simplify it

Ruublrr  Oct 24, 2018
 #1
avatar+90995 
+2

9 / (1 + cos x  )    + 9 / ( 1 - cos x)

 

We can do this

 

9 ( 1 - cos x)                            9 ( 1 + cos x)

_________________     +    ___________________

(1 + cos x) (1 - cos x)             (1 - cos x) ( 1 + cos x)

 

 

 

9 - 9 cos x  +  9  +  9 cos x 

______________________

   1  - cos^2 x

 

 

   18

_______

 sin^2 x

 

 

  18   *            1

               _______   

               (sin x)^2

 

 

18  *    [  1  / sin x ] ^2  

 

 

18  *  [ csc x ] ^2

 

 

18 csc^2 x

 

 

 

cool cool cool

CPhill  Oct 24, 2018
 #2
avatar+34 
+2

Thank you.  It makes sense now that I see it.

Ruublrr  Oct 24, 2018
 #3
avatar+90995 
0

OK...glad to help  .....!!!!

 

 

cool cool cool

CPhill  Oct 24, 2018

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