(2y·sin(1/x²))`+(x³·y)`=0
(2y)`·sin(1/x²) + 2y·(sin(1/x²))`+(x³)`·y+x³·y`=0
2y`·sin(1/x²) + 2y·cos(1/x²)·(1/x²)`+3x²·y+x³·y`=0
2y`·sin(1/x²) + 2y·cos(1/x²)·(-2x⁻³)+3x²·y+x³·y`=0
y`=((4y/x³)·cos(1/x²)-3x²y)/(2sin(1/x²)+x³)
42х^2-35х+42х=15х+42х^2+49
42х^2-35х+42х-15х-42х^2-49=0
-8х-49=0
8х=-49
х=-49/8
х=- 6 1/8
135у^2-81у+2у=135у^2-63у+6,5
135у^2-81у+2у-134у^2+63у-6,5=0
-16у-6,5=0
16у=-6,5
160у=-65
у=-65/160
у=-13/32