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Let m be a non-zero real parameter and (M) be the surface given by: xy + z? cos(x) 2mxe" = n(1 2m). An equation of the normal line to (M) at the point A(T, 1,0) is given by: (x = n+ (1- 2m)t y = 1+ nt , where t E R. z = -6mnt the above one None of these X= T - mnt y = 1+ mnt, where t E R. z = -6mnt (x = I - 2t y = nt , where t ER. z = -6nt the above one the above one