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The function is strictly decreasing on:
The function $f(x) = x^3 - 3x$ is strictly decreasing on:
- (a)$-1 < x < 1$
- (b)$-1 \le x \le 1$
- (c)$1 \le x < \infty$
- (d)$-\infty < x < -1$
Answer
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From ISC 2021 Specimen Mathematics Paper 1, question 1(viii).