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y is a function of x₁ and x₂. We are asked to derive y with respect to x₁, meaning that x₂ remains constant. 

Note that y' is the deriva...

First we need to change the limits, and by plugging in 1 and 0 to our substitution we find that the limits for u are arctan(1) and arctan(0) (or pi/4 and 0). Then we need to substitute for dx, and by diff...

In order to solve this equation we need to find a common denominator for the 2 fractions. It is impossible to name the common denominator while working with unknown variables such as x,y etc. but we know ...