\frac{dx}{dy} = 2 \times \sin^{2-1} 3y \times 3\cos 3y = 6 \times \sin 3y \ties \cos 3y
\frac{dx}{dy} = 2 \times \sin^{2-1} 3y \times 3\cos 3y = 6 \times \sin 3y \ties \cos 3y
\frac{dx}{dy} = 2 \times \sin^{2-1} 3y \times 3\cos 3y = 6 \times \sin 3y \ties \cos 3y
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