By chain rule, d/dx [sin(x²)] =
Acos(2x)
B2x cos(x²)
Csin(2x)
Dcos(x²)
Answer & Solution
Correct answer: B. 2x cos(x²)
Chain rule: d/dx [f(g(x))] = f'(g(x)) × g'(x). With f = sin, g = x²: derivative = cos(x²) × 2x = 2x cos(x²).
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