4. \( \left\{a^{2}-\left(b^{2}-c^{2}\right)\right\}-\left[2 a^{2}-\left\{a^{2}-\left(b^{2}-c^{2}...

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4. \( \left\{a^{2}-\left(b^{2}-c^{2}\right)\right\}-\left[2 a^{2}-\left\{a^{2}-\left(b^{2}-c^{2}\right)\right\}-2\left(b^{2}-c^{2}\right)\right] \).
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