Question #2f9ed

1 Answer
Jackson H.
Oct 5, 2017

No.

Explanation:

graph{cos(x) [-10, 10, -5, 5]}
If you look at the graph of #cos(x)# you will see it's symmetrical, with the #y#-axis being the line of symmetry.

Because of this, whichever #x# value we chose will have the same outcome as the #-x# value

This means that if #cos(x)=a#, then #cos(-x)=a#

Fun fact:
graph{sin(x) [-10, 10, -5, 5]}
Your original question is true with #sin(x)#
If #sin(x)=a#, then #sin(-x)=-a#

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