Uncertainty for n using calculus

[SHAWN JAMES]

Homework Statement:

Hi, I need help ASAP with finding the uncertainty of n i've been trying for an hour to figure out how to tackle this question can I please have some guidance as to how to approach the question?!! Thanks in advance.

Relevant Equations:

n=(Sin((Dm + a)/2))/(Sin(a/2))

i'm thinking of differentiating the inside of both sin functions but I'm not sure what to do with the sin. if anything, I'm new to this sort of uncertainty calculation. I have calculated the uncertainty and values for both Dm and a in advance.

 

I believe you first have to compute $\frac{dn}{da}$ and $\frac{dn}{d(Dm)}$ via a little quotient + chain rule. Then you can take the sum of all of the $dn$'s.

 

[rude man]

Homework Statement:: Hi, I need help ASAP with finding the uncertainty of n I've been trying for an hour to figure out how to tackle this question can I please have some guidance as to how to approach the question?! Thanks in advance.
Relevant Equations:: n=(Sin((Dm + a)/2))/(Sin(a/2))

i'm thinking of differentiating the inside of both sin functions but I'm not sure what to do with the sin. if anything, I'm new to this sort of uncertainty calculation. I have calculated the uncertainty and values for both Dm and a in advance.

Hint: $$ df = \frac {\partial f } { \partial x} dx + \frac {\partial f } {\partial y} dy ~+ ... ~$$
where f = f(x,y, ...) and x, y ... are assumed to be independent variables.