1.

{:(,"Column-I",,"Column-II"),((A),cos 20^(0) + cos 80^(0) - sqrt(3) "cos" 50^(0),(p),-1),((B),cos 0^(0) + "cos" (pi)/(7) + "cos" (2pi)/(7) + "cos" (4pi)/(7) + "cos" (5pi)/(7) + "cos" (6 pi)/(7),(q),-(3)/(4)),((C),cos 20^(0) + cos 40^(0) + cos 60^(0) - 4 cos 10^(0) "cos" 20^(0)"cos" 30^(0),(r),1),((D),"cos" 20^(0) cos 100^(0) + cos 100^(0) "cos" 140^(0) - cos 140^(0) "cos" 200^(0),(s),0):}

Answer»

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ANSWER :A - s; B - R; C - p; D - Q


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