1. Solve the following tasks:
1.21 The channel width a m at a right angle falls in another channel width b m. Determine the greatest length of logs that can be fused to this system of channels.

2. Carry out a full investigation of these functions and build their schedules.
2.21 y = (2x - 1) / (x - 1) 2

3. Carry out a full investigation of these functions and build their schedules.
3.21 y = ln (1 - 1 / x2)

4. Find the minimum and maximum values of the function y = f (x) on the interval [a; b]
4.21 y = x2 - 2x + 2 / (x - 1) [-1; 3]

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