The point \( \left(12, \frac{3\pi}{4} \right)\) in polar coordinates can be expressed as \((a, b)\) in Cartesian coordinates, where \(a\) and \(b\) are real numbers. What is the value of \(-ab?\)

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Suppose that \((a, \frac{\pi}{6})\) in polar coordinates represents the same point as \((b, 7)\) in Cartesian coordinates. What is the value of \(a^2+b^2\)?

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