sketch the curve with the given vector equation. Indicate with arrows the direction in which t increases: r(t)=costi - costj + sintk
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@harkan is it is a spehere of unit radius with centre at (1,-1,1)
ultimately, you make a table with t values in one column and r(t) vectors in the other column and then plot, point for point. I was seeing a wobbly circle... but with more points, I wouldn't be surprised if it is an ellipse.
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I guess the sin and cos give a circle in the usual way (in x and z) so then what does the additional cos in y do? If it was just t instead of cos t then that would produce a helix as t varied, whereas cos t is going to oscillate...