railway DFCCIL Executive 2025 Mock Test Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
மதிப்பிடுக: \(\left(\frac{\sin47^{\circ} }{\cos 43^{\circ}}\right)^2 + \left(\frac{\cos43^{\circ} }{\sin 47^{\circ}}\right)^2 - \rm 4 cos^245^{\circ}\)
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