(2x-1)/(sqrt(x^(2)-x-1))

Evaluate: int(2x+1)/(sqrt(x^(2)+2x-1))dx

Simplify (x+sqrt(x^(2)-1))/(x-sqrt(x^(2)-1))+(x-sqrt(x^(2)-1))/(x+sqrt(x^(2)-1))

Simplify : (a) sqrt(y+sqrt(2xy-x^(2))) + sqrt(y-sqrt(2xy-x^(2))) (b) (x+sqrt(x^2-1))/(x-sqrt(x^(2)-1)) -(x-sqrt(x^(2)-1))/(x+sqrt(x^(2)-1))

underset(x to 0)"Lt" (cos^(2)x-sin^(2)x-1)/(sqrt(x^(2)+1)-1)=

(xtendsto0)(cos^(2)x-sin^(2)x-1)/(sqrt(x^(2)+1)-1)

Evaluate: int(2x+1)/(sqrt(x^2+2x-1))dx

If sqrt(x^(2)-x +1) + (1)/(sqrt(x^(2)-x+1))=2-x^(2) , How many value possible for x?

if f(x)=(cos^(2)x-sin^(2)x-1)/(sqrt(x^(2)+1)-1),x!=0 and f(x)=k,x=0 is continuous at x=0 then k=