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y=ln(6x²-cos 3x³)
dy/dx=1/(6x²-cos 3x³) . (12x-(-sen(3x³)(9x²))
dy/dx=1/(6x²-cos 3x³).(12x+9x²sen(3x³))
dy/dx=(12x+9x²sen(3x³))/(6x²-cos 3x³)