जर sin(x + y) = cos {3(x + y)} असेल, तर cot {2(x + y)} चे मूल्य _______ आहे.

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

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Option 2 : 1
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दिलेले आहे:

जर sin(x + y) = cos {3(x + y)}

वापरलेले सूत्र:

sin A = cos B ⟹ A + B = π/2

गणना:

समजा A = x + y आणि B = 3(x + y)

⟹ A + B = π/2

⟹ (x + y) + 3(x + y) = π/2

⟹ 4(x + y) = π/2

⟹ x + y = π/8

आता, आपल्याला cot {2(x + y)} चे मूल्य शोधायची आहे

⟹ 2(x + y) = 2 × π/8

⟹ 2(x + y) = π/4

cot (π/4) = 1

म्हणूनच, योग्य उत्तर पर्याय (2) आहे.

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