Teaching EMRS PGT Mock Test 2023 Mathematics Differential Calculus Applications of Derivatives

फलन f(x) = -2x3 - 9x2 - 12x + 1 ______ अंतराल में एक घटता फलन है।

1
(-2, -1)
2
केवल (-∞, -2)
3
केवल (-1, ∞)
4
(-∞, -2) ∪ (-1, ∞)
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