Parametrize the Surface S

question 31

Essay

Parametrize the surface S.
- $$S \text { is the lower portion of the sphere } x ^ { 2 } + y ^ { 2 } + z ^ { 2 } = 49 \text { cut by the cone } z = \sqrt { x ^ { 2 } + y ^ { 2 } } \text {. }$$

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