Question: da Vx (sin 3x + cos 4x) O 2, Z (sin 3x + cos 4x) + Vx (3 cos 3x - 4 sin 4x) O

 da Vx (sin 3x + cos 4x) O 2, Z (sin

da Vx (sin 3x + cos 4x) O 2, Z (sin 3x + cos 4x) + Vx (3 cos 3x - 4 sin 4x) O (sin 3x + cos 4x) + Vx (3 sin 3x + 4 cos 4x) O (sin 3x + cos 4x) + vx (cos 3x - sin 4x) O jx 2 (3 sin 3x - 4 cos 4x) O Ex i (sin 3x + cos 4x) + 2 27 (3 sin 3x - 4 cos 4x)

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