Q 3081391227.     ` (\frac{\sin 50^{\circ}}{\cos 40^{\circ}} )^{2} + (\frac{\cos 28^{\circ}}{\sin 62^{\circ}} )^{2} - 2 \tan^{2} 45^{\circ}`


A

0

B

`frac{1}{2}`

C

1

D

-2

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