যদি sin(x + y) = cos {3(x + y)} হয়, তাহলে cot {2(x + y)} এর মান কত?

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SSC CPO 2024 Official Paper-I (Held On: 29 Jun, 2024 Shift 2)
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  1. 2
  2. 1
  3. -1
  4. -2

Answer (Detailed Solution Below)

Option 2 : 1
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SSC CPO : General Intelligence & Reasoning Sectional Test 1
50 Qs. 50 Marks 35 Mins

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প্রদত্ত:

sin(x + y) = cos {3(x + y)}

ব্যবহৃত সূত্র:

sin A = cos B ⟹ A + B = π/2

গণনা:

ধরা যাক A = x + y এবং B = 3(x + y)

⟹ A + B = π/2

⟹ (x + y) + 3(x + y) = π/2

⟹ 4(x + y) = π/2

⟹ x + y = π/8

এখন, আমাদের cot {2(x + y)} এর মান বের করতে হবে

⟹ 2(x + y) = 2 × π/8

⟹ 2(x + y) = π/4

cot (π/4) = 1

∴ সঠিক উত্তরটি হলো বিকল্প (2) 

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