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Solutionint_(0)^((1)/(5))(1)/(1+25x^(2))dxSubstitution{:[" Substitution ",u=5x],[" limif ",x=0=>u=0],[x=(1)/(5)=>u=1],[(dy)/(dx)=5]:}{:[int_(0)^(1)(1)/(5)(1)/(1+v^(2))dx=(1)/(5)du],[=(1 ... See the full answer