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समतलों के निम्न कुल z2 = kxy, k ∈ \(\mathbb{R}\) के लंबवत समतलों का सामान्य हल है

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CSIR-UGC (NET) Mathematical Science: Held on (26 Nov 2020)
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  1. ϕ(x2 - y2, xz) = 0, ϕ ∈ C1 (\(\mathbb{R}\)2)
  2. ϕ(x2 - y2, x2 + z2) = 0, ϕ ∈ C1 (\(\mathbb{R}\)2)
  3. ϕ(x2 - y2, 2x2 + z2) = 0, ϕ ∈ C1 (\(\mathbb{R}\)2)
  4. ϕ(x2 + y2, 3x2 - z2) = 0, ϕ ∈ C1 (\(\mathbb{R}\)2)

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Option 3 : ϕ(x2 - y2, 2x2 + z2) = 0, ϕ ∈ C1 (\(\mathbb{R}\)2)
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