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Math Help - Value of sec^2 x

  1. #1
    Junior Member
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    Value of sec^2 x

    Hi,

    Could some work out the value of sec^2 x when x is 0.25. I understand that sec^2 x is 1/cos^2 x. I keep getting 1.000019039 but I know this is not correct.

    Could someone see whether they get the same values.

    Also when x is equal to : 0.5, 0.75, and 1.

    I am revising the Simpson's rule.


    Thanks.
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  2. #2
    A Plied Mathematician
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    What kind of calculator do you have? Is it set in radians or degrees? What exact button combination are you using?
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  3. #3
    MHF Contributor

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    Set your calculator to radian mode. Especially when you are working in Calculus, where the derivative of the (sin(x))'= cos(x) is only true when x is in radians.
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