JEE Advanced | 2014Differential EquationHard
Question
The function y = f(x) is the solution of the differential equation
in (- 1, 1) satisfying f(0) = 0. Then
f(x) dx is
in (- 1, 1) satisfying f(0) = 0. Then
f(x) dx isOptions
A.

B.

C.

D.

Solution

I.F. =

So, y
=
(x4 + 2x)dx =
+ x2 + c Given f(0) = 0 ⇒ c = 0
So y =
= f(x)I =
f(x)dx = 
dx = 2
Let x = sinθ
I = 2
sin2 θdθ =
(1 - cos2θ)dθ=

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