$(1$ point$)$ Write the equation z$=3$x$2+3$y$2$z$=3$x$2+3$y$2$ in spherical coordinates.

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$($Simplify as much as possible$).$

Write the equation$4$x$2+4$z$2=74$x$2+4$z$2=7$in spherical coordinates.

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$=7=7$

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