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