d*y 4)5t - dt4 +3r²( - (sin t)y = 0 -)³ – (sin t)y = 0 dt 5)(sin x)y² + 2 y = 3x' – 5 6) ху ? + 3 ху — 2 х* у %3D 7 – 2 x' y = 7

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