If `lim_(xrarr0) (x(1+acos x)-bsin x)/(x)=1`, then a,b, are

lim_(xrarr0)(sqrt(1+x)-1)/x

lim_(xrarr0)((x-1+cosx)/(x))^(1//x)

If lim_(xrarr0)(axe^(x)-b log(1+x))/(x^(2))=3 , then the value of a and b are respectively.

lim_(xrarr0) (2x)/(sqrt(1+x)-1)

lim_(xrarr0) (2x)/(sqrt(1+x)-1)

lim_(xrarr0) (sqrt(1+x+x^(2))-1)/(x)

lim_(xrarr0) ((x+1)^(5)-1)/(x)

lim_(xrarr0) ((x+1)^(5)-1)/(x)

If lim_(xrarr0) (f(x))/(x^(2))=a and lim_(xrarr0) (f(1-cosx))/(g(x)sin^(2)x)=b (where b ne 0 ), then lim_(xrarr0) (g(1-cos2x))/(x^(4)) is