Solve Composite Function Homework: f(g(h(x)))

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SUMMARY

The discussion revolves around solving the composite function homework problem f(g(h(x))) where the solution is derived as f(g(h(x))) = f(g(√(x+3))) = f(cos(√(x+3))) = 2/(cos(√(x+3)) + 1). Participants confirm the correctness of the solution and discuss the necessity of including restrictions on the domain of x. It is concluded that while providing the domain may enhance understanding, it is not mandatory for this specific problem.

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Homework Statement


http://img171.imageshack.us/img171/543/pro3.png

The Attempt at a Solution


= f(g(h(x)))
= f(g(\sqrt{x+3}))
= f(cos\sqrt{x+3})
= \frac{2}{cos\sqrt{x+3}+1}

Is this right, and am I showing enough work to get full marks? Do I need restrictions for example?
 
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It's correct and looks fine. What do you mean by restrictions?
 
Bohrok said:
It's correct and looks fine. What do you mean by restrictions?

I meant by the restrictions on x.
 
So you mean giving the (restricted) domain. You shouldn't have to include that, unless it will make you feel better by doing so. :smile: I wouldn't since the question didn't ask, and finding the domain for this one is a little involved.
 
Alright, I'll stick with what I have. Thanks for the help. :)
 

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