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cos^4 30 - sin^4 30

Guest May 16, 2017
 #1
avatar+88769 
+1

 

Assuming degrees we have

 

cos^4 (30) - (sin^4 30)     factor

 

[ oos^2 ( 30)  +  sin^2 (30) ]  [  cos^2 (30)  -  sin^2 (30) ]  

 

[   1  ]    [  (√3 / 2 ) ^2    -  ( 1  / 2) ^2   ]    

 

3 / 4    -    1 / 4   

 

2 / 4    =      1 / 2

 

 

 

cool cool cool    

CPhill  May 16, 2017

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