+0  
 
0
108
1
avatar

Find the range of possible values of cos(x)^2 - sin(x)^2, where x is a real number.

 Mar 5, 2022
 #1
avatar+36433 
+1

cos(x)^2 - sin(x)^2    =

cos^2    - ( 1-cos^2 )

2cos^2 -1                              cos ranges from -1 to 1      the range then becomes    -1  to 1

 Mar 5, 2022

19 Online Users

avatar