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sin(arccos(x)) =

Ax
B1/x
Ccos(x)
Dsqrt(1 - x²)
Answer & Solution
Correct answer: D. sqrt(1 - x²)
Let θ = arccos(x), so cos θ = x. sin θ = sqrt(1 - cos²θ) = sqrt(1 - x²) (positive because θ ∈ [0, π]).
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