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

यदि sin θ + sin2θ = 1 है, तो cos2θ + cos4θ ज्ञात कीजिये। 

1
-2
2
2
3
-1
4
1
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