1. Show that this expression is a total differential of the function u (x, y). Find u (x, y) function
1.12. (Ysin (x + y) + xycos (x + y) - 9x2) dx + (xsin (x + y) + xycos (x + y) + 2y) dy
2. Solve the following tasks:
2.12. Calculate static moments about axes arc astroid x = 2cos3t, y = 2sin3t, located in the first quadrant
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