Nth derivative of ( frac{1}{(1+x^2)} )? – McqOptions

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1.	Nth derivative of ( frac{1}{(1+x^2)} )?
A.	(-1)<sup>n</sup>n! r<sup>-n-1</sup> Sin(n+1)
B.	(-1)<sup>n</sup>(n)! r<sup>-n-1</sup> Sin(-n-1)
C.	(-1)<sup>n+1</sup>(n+1)! r<sup>-n-1</sup> Sin(n+1)
D.	(-1)<sup>n+1</sup>(n+1)! r<sup>-n-1</sup> Sin(-n-1)
Answer» B. (-1)<sup>n</sup>(n)! r<sup>-n-1</sup> Sin(-n-1)

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