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Solve the Nonlinear System of Equations for Real Solutions {x2y2=15x2+y2=21\left\{ \begin{array} { l } x ^ { 2 } - y ^ { 2 } = 15 \\x ^ { 2 } + y ^ { 2 } = 21\end{array} \right.

question 13

Multiple Choice

Solve the nonlinear system of equations for real solutions.
- {x2y2=15x2+y2=21\left\{ \begin{array} { l } x ^ { 2 } - y ^ { 2 } = 15 \\x ^ { 2 } + y ^ { 2 } = 21\end{array} \right.


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