-9x²+16y²+9z²+128y-54z+193=0, 18x²+9y²+8z²+36y-160z+764=0

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A: Steps and explanations are as follows:In case of any doubt, please let me know. Thank you.

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A: Step 1(a) 4/7(b) ∞ (inf)(c) 0 (d) -∞ (-inf)Step 2(a) 1(b) [1 + (1/e^(2x))] / [ 1 - (1/ e^(2x))](c)…

A: The given expression is D2 + 312 - 12 - 332. Here, we have four terms: D2, 312, -12, and 332.

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