1 11. (x cos x)" + (xsin x)" dy
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Answer:
xcosx
dx
dy
+y(xsinx+cosx)=1
dx
dy
+y(tanx+
x
1
)=
xcosx
1
.
∴I.F.=e
∫(tanx+
x
1
)dx
=e
log(xsecx)
=xsecx.
Thu required solution is, y(xsecx)=∫
xcosx
1
.xsecx=tanx+c
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