railway DFCCIL Executive 2025 Mock Test Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
What is the value of \(\frac{\cos 50^{\circ}}{\sin 40^{\circ}}+\frac{3~\text{cosec}~80^{\circ}}{\sec 10^{\circ}}\) − 2 cos 50°.cosec 40° ?
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