[" 9.If at each point of the curve "y=x^(3)-ax^(2)+x+1" ,the tangent is inclined at an acute angle with the "],[" positive direction of "x" -axis.then "]

If at each point of the curve y=x^(3)-ax^(2)+x+1, the tangent is inclined at an acute angle with the positive direction of the x -axis,then a>0 (b) a<-sqrt(3)-sqrt(3)<=a<=sqrt(3)( d) none of these

If at each point of the curve y=x^3-a x^2+x+1, the tangent is inclined at an acute angle with the positive direction of the x-axis, then (a) a >0 (b) a<-sqrt(3) (c) -sqrt(3)<=a<= sqrt(3) (d) non eoft h e s e

If at each point of the curve y=x^3-a x^2+x+1, the tangent is inclined at an acute angle with the positive direction of the x-axis, then (a) a >0 (b) a<-sqrt(3) (c) -sqrt(3)< a< sqrt(3) (d) non eoft h e s e

If at each point of the curve y=x^3-a x^2+x+1, the tangent is inclined at an acute angle with the positive direction of the x-axis, then (a) a >0 (b) a<-sqrt(3) (c) -sqrt(3)< a < sqrt(3) (d) non eoft h e s e

If at each point of the curve y=x^3-a x^2+x+1, the tangent is inclined at an acute angle with the positive direction of the x-axis, then a >0 (b) a<-sqrt(3) -sqrt(3)<=a<= sqrt(3) (d) non eoft h e s e

If at each point of the curve y=x^3-a x^2+x+1, the tangent is inclined at an acute angle with the positive direction of the x-axis, then (a) a >0 (b) a<-sqrt(3) (c) -sqrt(3)<=a<= sqrt(3) (d) non eoft h e s e

If at each point of the curve y=x^3-a x^2+x+1, the tangent is inclined at an acute angle with the positive direction of the x-axis, then (a) a >0 (b) a<-sqrt(3) (c) -sqrt(3)<=a<= sqrt(3) (d) non eoft h e s e

If the tangent at each point of the curve y = x^3-ax^2 + x +1 is inclined at an acute angle with the positive direction of x-axis then find a.