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`"Let "u=tan^(-1)((sqrt(1+x^(2))-1)/(x))and v= tan^(-1) x.` <br> `(du)/(dx)=cos x and (dv)/(dx)=-(sin x)/(2sqrt(cos x))` <br> `"or "(du)/(dv)=(du//dv)/(dv//dx)=(cot x)/(-(sin x)/(2sqrt(cos x)))=-2sqrt(cos x cot x "cosec" x )`**Definition and geometric meaning.**

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