Find a parametric representation for the surface. (enter your answer as a comma-separated list of equations. let x, y, and z be in terms of u and/or v.) the plane through the origin that contains the vectors i − j and j − k.

The question ask to calculate and form the parametric representation for the surface and the plane through the origin that contains the vector i-j and j-k, in that fact, base on my formulation, the equation of the surface in parametric form is S:(U,V,-U-V). I hope this would help 

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.