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[" 24.The value of "cos^(2)48^(@)-sin^(2...

[" 24.The value of "cos^(2)48^(@)-sin^(2)12^(@)" is - "],[[" (a) "(sqrt(5)+1)/(8)," (b) "(sqrt(5)-1)/(8)],[" (c) "(sqrt(5)+1)/(5)," (d) "(sqrt(5)+1)/(2sqrt(2))]]

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