UPSC NDA I 2012 Mathematics Paper

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Question : 69 of 120

Marks: +1, -0

Which of the following differential equations is not linear?

‌
d2y
dx2
+4y=0
x‌
dy
dx
+y=x3
(x−y)2‌
dy
dx
=9
cos2x‌
dy
dx
+y=tan‌x

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