\frac{\sin 50^{\circ}-\sin 40^{\circ}}{\cos 50^{\circ}-\cos 40^{\circ} – InterviewSolution

1.	\frac{\sin 50^{\circ}-\sin 40^{\circ}}{\cos 50^{\circ}-\cos 40^{\circ}}= ______(a) - 2(b) 2(c) -1(d) 1
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