Hi,

I'm having trouble finding the derivative for:

g(x) = [sec(.5x)tan(.5x)]

It's a lot of steps, but my answer is: .5(sec(.5x)+tan(.5x))[.5sec(.5x)]

I'm very sure that it is incorrect. since I just basically used the chain rule for the first function, then multiplying it with the chain rule derivative of the second function.

Any help would be appreciated.