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Problem
Problem
Find whether the points
(
−
a
,
−
b
)
(-a,-b)
(
−
a
,
−
b
)
,
(
−
(
s
+
1
)
a
,
−
(
s
+
1
)
b
)
(-(s+1)a,-(s+1)b)
(
−
(
s
+
1
)
a
,
−
(
s
+
1
)
b
)
, and
(
−
t
a
,
−
t
b
)
(-ta,-tb)
(
−
t
a
,
−
t
b
)
are collinear?
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