A) 0
B) 1
C) -1
D) 2
Correct Answer: C
Solution :
\[(\cos 1{}^\circ +\cos 179{}^\circ )+(\cos 2{}^\circ +\cos 178{}^\circ )+....\] \[+(\cos 89{}^\circ +\cos 91{}^\circ )+\cos 90{}^\circ +\cos 180{}^\circ =-1\].You need to login to perform this action.
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