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

2cos2A + 1 = 2sin3A ಮತ್ತು A + B = 90° ಆಗಿದ್ದರೆ, cosB ಮೌಲ್ಯವನ್ನು ಕಂಡುಹಿಡಿಯಿರಿ.

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