1
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
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The integrating factor of the first order differential equation $${x^2}({x^2} - 1){{dy} \over {dx}} + x({x^2} + 1)y = {x^2} - 1$$ is
A
ex
B
$$x - {1 \over x}$$
C
$$x + {1 \over x}$$
D
$${1 \over {{x^2}}}$$
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