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The sinc-like curve y = (sin x)/x, for x nonzero, has slope function
A(x cos x + sin x)/x^2
B(x sin x - cos x)/x^2
C(x cos x - sin x)/x^2
D(sin x - x cos x)/x^2
Answer & Solution
Correct answer: C. (x cos x - sin x)/x^2
The quotient rule gives (cos x)(x) - (sin x)(1), all over x^2.
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