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Question

If y=tan1(1+a2x21ax), then (1+a2x2)y′′+2a2xy1=

A
2a2
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B
a2
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C
2a2
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D
0
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Solution

The correct option is D 0
y=tan1[1+a2x21ax]
Put ax=tanθ
=tan1[1+tan2θ1tanθ]
=tan1[secθ1tanθ]
=tan1⎢ ⎢ ⎢1cosθ1sinθcosθ⎥ ⎥ ⎥
=tan1[1cosθsinθ]
=tan1[tan(θ2)]
=θ2
=θ2=tan1ax2
y=tan1ax2

y=12×a1+x2a2
y=a2(1+a2x2)
y′′=a2[2a2x(1+a2x2)2]
so (1+a2x2)y′′+2a2ay
=a2×(2a2x)(1+a2x2)+2ax×a2(1+a2x2)
=2a3x2(1+a2x2+a3x1+a2x2
=0

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