Test the following equation for exactness. If exact or not exact. 1 . ( x + 2y) dx + ( 2x ty )= 0 2. ( 2 xu2 - 3 x2 ) dx + ( x2 + 24) dy = 0 3. ( 6 x + 42 ) dx + y ( 2 x - 3 ) dy = 0 + What is the degree of the given function f ( x,y ) = xty - 1x