+0  
 
0
32
1
avatar
what's the difference between cos( and cos-1( ?????
 
 Jan 9, 2019
 #1
avatar+95179 
+1

cos theta is a ratio, it is always between -1 and +1

inverse cos is an angle.    Inverse cos is the same as arc cos.

 

In the trianlge illustrated:

 

\(\boxed{cos \theta = \frac{adj}{hyp}\\~\\ cos^{-1}\left( \frac{adj}{hyp}\right)=\theta\\}\\~\\ also\\~\\ acos\left( \frac{adj}{hyp}\right)=cos^{-1}\left( \frac{adj}{hyp}\right)=\theta\\~\\\)

 

 
 Jan 9, 2019

14 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.