cot 15° cot 25° cot 45° cot 75° cot 65° এর মান কত?

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SSC CGL 2022 Tier-I Official Paper (Held On : 02 Dec 2022 Shift 3)
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  1. 1
  2. √3
  3. 2
  4. √2

Answer (Detailed Solution Below)

Option 1 : 1
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প্রদত্ত:

cot 15° cot 25° cot 45° cot 75° cot 65°

ব্যবহৃত সূত্র:

F4 Madhuri Teaching 27.03.2023 D1 V2

গণনা:

cot 15° cot 25° cot 45° cot 75° cot 65°

⇒ cot 15° x cot 25° x cot 45° x cot (90° - 15°) x cot (90° - 25°)

⇒ cot 15° x cot 25° x cot 45° x tan 15° x tan 25°

⇒ 1 x 1 x 1 = 1

∴ প্রয়োজনীয় ফলাফল 1

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