(MULTIPLE CHOICE) Which of the following equations is(are) exact? (A) (r - y3 + y? sin r)dr = (3ry? + 2y cos a)dy (C) (2x – 1)dr + (3y + 7)dy = 0 %3D %3D (B) (wmy - e)dz + G + zlay dy = 0 +x In y ) dy = 0 (D) (x³ + y³) dx – 3ry dy = 0 %3D

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