railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

যদি A = 30° হয়, তাহলে cos2 A + cos2 (60° + A) + cos2 (60° - A) এর মান নির্ণয় করুন।

1
-3/2
2
1
3
3/2
4
√3/2
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