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[" 31.Prove that: "],[" (i) "(d)/(dx)[2x...

[" 31.Prove that: "],[" (i) "(d)/(dx)[2x tan^(-1)x-log(1+x^(2))]=2tan^(-1)x]

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Prove that (d)/(dx){2x tan^(-1)x-log (1+x^(2))}=2 tan^(-1)x.

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