#### Question

a.

d²t/dx² + d²t/dy2 + d²t/dz2 + q g = (1/α) (d t/d T)

b.

2d²t/dx² + d²t/dy2 + d²t/dz2 + 34q g = (d t/d T)

c.

d²t/dx² + 3d²t/dy2 + d²t/dz2 = (1/α) (d t/d T)

d.

4d²t/dx² + d²t/dy2 + d²t/dz2 + 1/2q g = (1/α) (d t/d T)

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