Question: Plotting Non Linear Homogenous Different Equations On Maple!

I'm really struggling with plotting non linear equations onto maple.

I can plot Linear ones with DEtools quite easily, but struggle with Non Linear equations. I've tried PDEtools but not sure if thats relevant.

Trying to plot/display Basin of Attraction;

D(x)(t) = y
D(y)(t) = -ksinx      (can take k = -1)

Any ideas ?

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