Click HERE
to see how the graph changes as we change a and hold b, c and
d constant at b=c=d=1
Click HERE
to see how the graph changes as we change b and hold a, c and
d constant at a=c=d=1
Click HERE
to see how the graph changes as we change c and hold a, b and
d constant at a=b=d=1
Click HERE
to see how the graph changes as we change d and hold a, b and
c constant at a=b=c=1
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to Investigtion 6