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

যদি 2sin2x - 1 = 0 হয় তবে x-এর মান নির্ণয় করুন। 

1
\(\pi \over 4\)
2
\(\pi \over 2\)
3
0
4
π 
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