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The order of the differential equation o...

The order of the differential equation of family of curves `y=C_(1)sin^(-1)x+C_(2)cos^(-1)x+C_(3)tan^(-1)x+C_(4)cot^(-1)x` (where `C_(1),C_(2),C_(3) and C_(4)` are arbitrary constants) is

A

2

B

3

C

4

D

None of these

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