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Math Help - Simple question

  1. #1
    Senior Member sakonpure6's Avatar
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    Simple question

    I know this is kind of dumb but cos(-x) = - cos (x) ? Right?
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  2. #2
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    Re: Simple question

    Quote Originally Posted by sakonpure6 View Post
    I know this is kind of dumb but cos(-x) = - cos (x) ? Right?
    NO! It is not correct. \cos(x) is an even function, therefore \cos(x)=\cos(-x)~.
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    Senior Member sakonpure6's Avatar
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    Re: 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!!!!
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