state gov TSPSC DAO (Divisional Accounts Officer) Mock Test 2024 Quantitative Aptitude Trigonometry

যদি a = cot A + cos A এবং b = cot A - cos A, তাহলে a 2 - b 2 - 4 \(\rm \sqrt{ab}\) এর মান নির্ণয় করুন।

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