sin θ = 2/√5 எனில், sec2θ + cot2θ என்பதன் மதிப்பு?

  1. 21/4
  2. 5/2
  3. 10/7
  4. 1

Answer (Detailed Solution Below)

Option 1 : 21/4
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Detailed Solution

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கொடுக்கப்பட்டுள்ளது:

Sinθ = 2/√5

கருத்துரு:

முக்கோணவியல் சார்பு பயன்படுத்தும் போது, sec θ and cot θ-இன் மதிப்புகளைக் கணக்கிடலாம்.

கணக்கீடு​:

sin θ = (செங்குத்து)/(கர்ணம்)

F1 Shailendra Madhuri 23.02.2021 D9

∆ABC-இல்;

(AC)2 = (AB)2 + (BC)2

⇒ (√5)2 = (2)2 + (BC)2

⇒ 5 = 4 + (BC)2

⇒ (BC)2 = 5 – 4

⇒ (BC)2 = 1

⇒ BC = 1

sec θ = (கர்ணம்)/அடித்தளம்)

⇒ sec θ = √5/1 = √5

cot θ = (அடித்தளம்)/(செங்குத்து)

⇒ cot θ = 1/2

(sec θ)2 + (cot θ)2 = (√5)2 + (1/2)2

⇒ 5 + 1/4

⇒ 21/4

∴ sec2θ + cot2θ என்பதன் மதிப்பு 21/4 ஆகும்.

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