Question:medium

The set of all values of a for which the function f(x)=(a²-3a+2)(cos²x/4-sin²x/4)+(a-1)x is decreasing is

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A linear term dominates bounded trigonometric parts for monotonicity.
Updated On: Mar 20, 2026
  • \([1,\infty)\)
  • \((0,1)\cup(1,4)\)
  • \((-2,4)\)
  • (1,3)∪(3,5)
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The Correct Option is A

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