val I, is called a fi rst order linear differential equation in y. Dividing
Eq. (2.73) by
0
,p
we can write it as
()()
dy
PxyQx
dx
+= (2.74)
which is taken as the standard form of the fi rst order linear equa-
tion. Here the dependent variable y and its derivative
dy
dx
occur
separately and to a fi rst degree. For example,
(i)
(1)23
dy
xxyx
dx
2
++=
(ii)
cos(sin)tan
dy
xxyx
dx
+=
If
()0,Qx≡
/
then Eq. (2.73) ...
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