a t entre 0 e 4, com valores iniciais -1.25 e 0.75 para (x, y) em t=0:
</p>
<pre class="example">(%i21) sol: rk([4-x^2-4*y^2,y^2-x^2+1],[x,y],[-1.25,0.75],[t,0,4,0.02])$
</pre>
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