[" The value of "],[[cos^(3)((pi)/(8))*c...

[" The value of "],[[cos^(3)((pi)/(8))cos((3 pi)/(8))+sin^(3)((pi)/(8))sin((3 pi)/(8))," is "],[[" (a) "(1)/(2sqrt(2))," (b) "(1)/(sqrt(2))," (c) "(1)/(4)," (d) "(1)/(2)]]]

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