Okay so here's the background.

g=(4pi^2/T^2)l

The instructions are:

Estimate the uncertainty in g using the uncertainty propagation for a general function. The specific formula you should obtain for delta g is:

#1 Δg= g (sqrt(Δl/l)^2 + (2 ΔT/T)^2)

The uncertainty equation is :

#2 ΔF=(sqrt (partial derivative of x)^2( Δx)^2 + (partial derivative of y)^2( Δy)^2)

So basically, make equation #2 look like #1, and solve for delta g.

So the question is, how do I simplify equation #2 to look like equation #1.

F=g , x=l, and y=T is those equations.