The transform equation of `r^(2)cos^(2)theta = a^(2)cos 2theta` to cartesian form is`

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The transform equation of `r^(2)cos^(2)theta = a^(2)cos 2theta` to cartesian form is`(x^(2)+y^(2))x^(2)=a^(2)lambda`, then value of `lambda` is
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