[MNR 1979]
A) 1
B) 0
C) 1/2
D) 2
Correct Answer: B
$ \sin 50^{o}-\sin 70^{o}+\sin 10^{o} $ $ =-2\cos 60^{o}\sin 10^{o}+\sin 10^{o} $ $ =,\sin ,10^{o},(1-2\cos 60^{o})=0. $
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