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Math Help - Polar to rectangular form

  1. #1
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    Polar to rectangular form

    How about this one?
    r^2= sec^2(theta) - tan^2(theta)
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  2. #2
    MHF Contributor Mathstud28's Avatar
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    \sec(x)\ne\frac{1}{\sin(x)}
    Last edited by Mathstud28; December 15th 2008 at 08:07 PM.
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  3. #3
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    Thank you!!!!!
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  4. #4
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    Hello, cmr7!

    Someone created this problem as a joke . . .



    Write in rectangular form: . r^2\:=\: \sec^2\!\theta - \tan^2\!\theta

    We're expected to know this identity: . \sec^2\!A - \tan^2\!A \:=\:1

    . . and this conversion: . r^2 \:=\:x^2+y^2



    So: . r^2 \:=\:\sec^2\!\theta - \tan^2\!\theta\;\text{ becomes: }\:r^2 \:=\:1 \quad\Rightarrow\quad x^2+y^2 \:=\:1

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  5. #5
    MHF Contributor Mathstud28's Avatar
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    Quote Originally Posted by Soroban View Post
    Hello, cmr7!

    Someone created this problem as a joke . . .



    Yeah, apparently for me.
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  6. #6
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    me too

    I am in the class right now so all this should be fresh on my mind and it got past me also. I am going on 4 night sin a row of studying for this final. Maybe I should just get some sleep now haha!
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