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Value of cos^3 (pi/8)cos^3 ((3pi)/8) + s...

Value of `cos^3 (pi/8)cos^3 ((3pi)/8) + sin^3 (pi/8)sin^3 ((3pi)/8)` is

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The value of sin^2 (pi/8)+sin^2 ((3pi)/8)+sin^2 ((5pi)/8)+sin^2 ((7pi)/8) is

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