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[" If "cos40^(@)=x" and "cos theta=1-2x^(2)," then the "],[" possible values of "theta" lying between "0^(@)" and "360^(@)],[" is "],[[" (a) "100^(@)" and "260^(@)," (b) "80^(@)" and "280^(@)],[" (c) "280^(@)" and "110^(@)," (d) "110^(@)" and "260^(@)]]

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