` ( \frac{\sin 50^{\circ}}{\cos 40^{\circ}} )^2+ ( \frac{\cos 28^{\circ}}{\sin 62^{\circ}} )-2 \tan ^2 45^{\circ}=`

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Q 3002712638.     ` ( \frac{\sin 50^{\circ}}{\cos 40^{\circ}} )^2+ ( \frac{\cos 28^{\circ}}{\sin 62^{\circ}} )-2 \tan ^2 45^{\circ}=`

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