-cos(60) = cos(60)?

  • #1
I was thinking about this, and wanted to know if it was true...

-cos(60) = cos(-60) = cos(300) = cos(60)
 

Answers and Replies

  • #2
JFo
92
0
no its not,

cos(-x) = cos(x) ( cos is an even function )

If you draw these angles over the unit circle, then cos(x) refers to the x component of where the ray intersects the circle. For 60 degrees and -60 degrees, the x component lies to the right of the y axis, so both are positive (and equal).
 
  • #3
Ok, thanks for clearing that up for me.
 

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