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

यदि A = 30° है, तो cos2 A + cos2 (60° + A) + cos2 (60° – A) का मान ज्ञात कीजिये।

1
-3/2
2
1
3
3/2
4
√3/2
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