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owlet

  • one year ago

Is cos(-x) = cos x? why? I'm confused.

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  1. owlet
    • one year ago
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  2. owlet
    • one year ago
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    oh is it because of the graph? symmetrical to the y-axis then sin x is odd because it is symmetrical to the origin?

  3. freckles
    • one year ago
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    cos(x) is an even function f(-x)=f(x) means f is an even function what even function is that it is symmetrical about the y-axis this means the graph can be founded about the line that is called the y-axis and see half the graph lay perfectly over the other half

  4. freckles
    • one year ago
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    and yes sin(x) is odd so sin(-x)=-sin(x)

  5. owlet
    • one year ago
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    thank you!

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