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समुच्चय S= {theta in [ -4 pi,4 pi] : 3 c...

समुच्चय `S= {theta in [ -4 pi,4 pi] : 3 cos^(2)2 theta + 6 cos 2 theta - 10 cos^(2) theta + 5 = 0 }`में अवयवों की संख्या है _______।

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