Question: Plotting multiple curves

Hi! I'm trying to plot a graph of (u^2/sin^2(k))-(v^2/cos^2(k)) where the value of k varies. i've found the kind of command that plots multiple lines on the same graph: plot({seq((x-k)^2,k=0..5)},x=-10..10); but am not sure how to change it to produce a graph with multiple lines on for my function which has both u and v that vary. Thanks
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