Differentiate each term with respect to
x
, then solve for
y
'
.
d
y
d
x
=
y
−
x
+
2
y
+
−
2
x
sec
(
x
y
−
y
2
)
+
tan
(
x
y
−
y
2
)
x
(
−
x
+
2
y
)
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