railway RRB JE (CBT I + CBT II) Mock Test 2024 Mathematics Trigonometry Trigonometric Ratios

যদি sin x + sin2x = 1 হয়, তাহলে cos2x + cos4x এর মান কত হবে?

1
1
2
2
3
1.5
4
কোনওটিই নয়
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