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[(2cos theta-1)(2cos2 theta-1)(2cos4 the...

[(2cos theta-1)(2cos2 theta-1)(2cos4 theta-1)=],[[" (a) "(2cos8 theta+1)/(2cos theta+1)," (b) "(2cos8 theta-1)/(2cos theta+1)],[" (c) "(2cos8 theta+1)/(2cos theta-1)," (d) None of these "]]

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