CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2008

  • question_answer
    If\[x=h+a\text{ }sec\theta \]and\[y=k+b\text{ }cosec\theta \]. Then

    A)  \[\frac{{{a}^{2}}}{{{(x+h)}^{2}}}-\frac{{{b}^{2}}}{{{(y+k)}^{2}}}=1\]

    B)  \[\frac{{{a}^{2}}}{{{(x-h)}^{2}}}+\frac{{{b}^{2}}}{{{(y-k)}^{2}}}=1\]

    C)  \[\frac{{{(x-h)}^{2}}}{{{a}^{2}}}+\frac{{{(y-k)}^{2}}}{{{b}^{2}}}=1\]

    D)  \[\frac{{{(x-h)}^{2}}}{{{a}^{2}}}-\frac{{{(y-k)}^{2}}}{{{b}^{2}}}=1\]

    E)  \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}+{{b}^{2}}\]

    Correct Answer: B

    Solution :

    Given equations can be rewritten as \[\cos \theta =\frac{a}{x-n},\sin \theta =\frac{b}{y-k}\] Since, \[{{\cos }^{2}}\theta +{{\sin }^{2}}\theta =1\] \[\therefore \] \[\frac{{{a}^{2}}}{{{(x-h)}^{2}}}+\frac{{{b}^{2}}}{{{(y-k)}^{2}}}=1\]


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