other govt exam CSIR Junior Secretariat Assistant (JSA) 2025 Mock Test Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

যদি cot(2θ + 25°) = tan(θ + 20°) হয়, তবে cot3θ + sec3θ এর মান নির্ণয় করুন।

1
1
2
√2
3
1 + √2 
4
2
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