describe xy - trace, xz - trace, yz - trace. draw each trace a) z^2 - 4x^2 = 9 - 4y^2 b) z^2 - 4x^2 - y^2 = 4 c) x^2 + 2y^2 +4z^2 = 16 d) x^2 - 4y^2 = z

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