Write the expression sin(tan^-1)x) as an algebraic expression in x (without trig or inverse trig functions).

A(sqrt (1+x^2))/ (x)

B(1) / (sqrt (1+x^2))

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

D(x) / (sqrt (1+x^2))

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