फलन का अधिकतम मान क्या है, जहां  है?

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NDA 01/2025: English Subject Test
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प्रयुक्त सूत्र:

  • sin θ/cos θ = tan θ 
  • cos θ/sin θ = cot θ 
  • sin2θ + cos2θ = 1
  • 2sin θ cos θ = sin 2θ

 

गणना:

    

⇒ 

⇒ 

⇒ 

⇒ f(x) = sin x cos x ()    [∵ sin2θ + cos2θ = 1]  

⇒ f(x) = sin 2x        [∵ 2sin θ cosθ = sin 2θ]

हम जानते हैं कि, -1 ≤ sin θ ≤ 1

⇒  -1 ≤ sin 2x ≤ 1 

∴  f(x)max(1) = 1/2

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