Question
Download Solution PDFযদি sin(x + y) = cos {3(x + y)} হয়, তাহলে cot {2(x + y)} এর মান কত?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFপ্রদত্ত:
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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