railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

2cos2A + 1 = 2sin3A এবং A + B = 90° হলে, cosB এর মান নির্ণয় করুন।

1

1/2

2

1

3

0

4

1/√2

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