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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