12tan A = 5 எனில், cosec A =?

A. 13/5

B. 12/13

C. 5/13

D. 12/5

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NTPC Tier I (Held On: 5 Apr 2016 Shift 1)
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  1. B
  2. C
  3. A
  4. D

Answer (Detailed Solution Below)

Option 3 : A
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
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Detailed Solution

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கொடுக்கப்பட்டது:

12tan A = 5

பயன்படுத்தப்பட்ட கருத்து:

திருக்கோண விகிதங்களின் கருத்தைப் பயன்படுத்தி,

tanθ = செங்குத்து / அடிப்பக்கம்

cosecθ = கர்ணம் / செங்குத்து

கணக்கீடு:

quesImage4072

12tanA = 5

⇒ tanA = 5/12

tanA = BC/AB

BC/AB = 5/12

ΔABC ல்,

பிதாகரஸ் தேற்றத்தைப் பயன்படுத்தி,

BC2 + AB2 = AC2

⇒ 52 + 122 = AC2

⇒ 25 + 144 = AC2

⇒ AC = √169

⇒ AC = 13

cosecA = AC/BC

⇒ cosecA = 13/5

cosecA இன் மதிப்பு 13/5.

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