Answer (Detailed Solution Below)
Option 2 :
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Detailed Solution
Download Solution PDFसंकल्पना:
x ∈ R के लिए, -1 ≤ cos x ≤ 1
गणना:
दिया गया है, f(x) =
अब, हम जानते है: - 1 ≤ cos x ≤ 1
⇒ - 2 ≤ - 2cos x ≤ 2
⇒ 1 - 2 ≤ 1 - 2cos x ≤ 1 + 2
⇒ - 1 ≤ 1 - 2cos x ≤ 3
⇒ - 1 ≤
⇒ - 1 ≤ f(x) ≤
∴ f(x) का परिसर
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