Taylor polynom and some functionproblem.

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Anyone bored enough to want to help me out with some calculus? I got to deliver this in 6 hours and can't work these out. Help would be SO much appreciated, I've been at it all night and can't make it out.

1. y^2 - e^sin(x) + xy = sin (x)* cos (y) +3
assume y= y(x) and find y ' (0)

2. Find Taylor polynom of 3rd degree(correct English word?) for x ln x IF x = 1 AND use this to approximate 2 Ln 2. Use the estimate in E3 to find an intervall that contains 2 Ln 2.

3. g(x) = Sin (x) / Cos3 (x).
Show that g(x) have an inverse function in the interval x∈ ( -π/2, π/2). What is D(g^-1)? (Looks like a D, can't find the right one)

AND find the (d/dx)g^-1(x) in the point x = 2. (hint: g(π/4 = 2) )
 
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Bump. Please, anyone. I really need this to get my paper approved, and I don't know where else to ask.

REALLY would be appreciated. If you only can be bothered to solve one that is perfectly fine.
 
What have you tried so far?
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...

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