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Math Help - sec x

  1. #1
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    sec x

    sec x is undefined for

    0 degrees
    45 degrees
    90 degrees
    135 degrees
    180 degrees

    anyone know this rule want to help me out?
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by netbook View Post
    sec x is undefined for

    0 degrees
    45 degrees
    90 degrees
    135 degrees
    180 degrees

    anyone know this rule want to help me out?
    \sec x fails to exist when \cos x=0.

    What do you think the values are now?
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  3. #3
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    could it be for 90 degrees i think the graph of the sec of x has a vertical asymptote at 90 right???
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  4. #4
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by netbook View Post
    could it be for 90 degrees i think the graph of the sec of x has a vertical asymptote at 90 right???
    Yup, its 90^{\circ}.
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  5. #5
    Senior Member nikhil's Avatar
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    Wink

    Quote Originally Posted by netbook View Post
    could it be for 90 degrees i think the graph of the sec of x has a vertical asymptote at 90 right???
    even without graph
    sec(90)=1/cos(90)=1/0 (as cos(90)=0)
    since 1/0 is undefined therefor secx is also undefined for x=90 degrees
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  6. #6
    Senior Member pacman's Avatar
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    netbook, look at this. Just click the attachment to enlarge
    Attached Thumbnails Attached Thumbnails sec x-secant-g.gif  
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