#### Question

a.

1/A (1/h₁ + δ/k + 1/h₂)

b.

A (1/h₁ + δ/k + 1/h₂)

c.

1/A (h₁ + δ/k + h₂)

d.

A (1/h₁ + δ/k + 1/h₂)

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