dx 21. If y Var? +1 = log {Vox2 +1 – x} , then (22 +1) dy +xy+1= a) o (b) 1 (c) 2 (d) None of these

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( y=frac{log (sqrt{x^{2}+1}-n)}{sqrt{x^{2}+1}} ) ( left.=1 frac{d y}{d x}=frac{log f(sqrt{x^{2}+1 cdotleft(frac{x}{sqrt{x^{2}+1}}-1right)}{(sqrt{x^{2}+1}-x)}-cos (sqrt{x^{2}+1-4 x^{2}+12 x}}{x^{2}+1}right) ) ( Rightarrowleft(x^{2}+1right) frac{d y}{d x}=sqrt{y^{2}+1} frac{-1}{sqrt{y^{2}+1} cdot(sqrt{x^{2}+1})}-x y ) ( Rightarrowleft(x^{2}+1right) frac{d y}{d x}+x y+1=0 ) ( p(z ) give rating

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