Calculus (Urgent!!)

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Hello everyone,

I need help with the following problems.

Find the partial derivative of the following:

1) f(X1, X2) = X1^1/2*X2^3/4
2) f(x1,x2,x3) = ln(x1)x2 + 3x3
3) f(x,y) = 3x + 4y
4) f(x,y) = x^1/2 +x/y + y/x

Find the maximum of the following function:
1) f(x1,x2) = 5x1 - x1^2 + 2 - x2^2

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