I know this is kind of dumb but cos(-x) = - cos (x) ? Right?

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- Sep 16th 2013, 02:29 PMsakonpure6Simple question
I know this is kind of dumb but cos(-x) = - cos (x) ? Right?

- Sep 16th 2013, 02:49 PMPlatoRe: Simple question
- Sep 16th 2013, 02:55 PMsakonpure6Re: Simple question
Omg thank you!!! I knew that sin(-x) = - sin x but when I put in a negative value for cos say, cos (-60) i got a positive number. Thanks!!!!