Find an equation of the tangent plane to the parametric surface represented by r at the specified point. 
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Definitions:
LCL
Lower Control Limit, a statistical measure in quality control processes that defines the lower threshold acceptable for variation.
UCL
Upper Control Limit, a line on a control chart that represents the maximum acceptable limit of variation in a process.
T-distribution
A statistical probability distribution utilized for estimating parameters of a population when dealing with a small sample size and an unknown population variance.
Degrees Of Freedom
The number of independent pieces of information available to estimate another parameter or the dimensionality of a statistical calculation.
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