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[" The "quad " value "," of "],[sin^(4)(...

[" The "quad " value "," of "],[sin^(4)(pi)/(8)+cos^(4)(3 pi)/(8)+sin^(4)(5 pi)/(8)+cos^(4)(7 pi)/(8)],[" equal to :- "]

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cos ^(4) (pi)/(8)+cos ^(4) (3 pi)/(8)+cos ^(4) (5 pi)/(8)+cos ^(4) (7 pi)/(8)=

The value of sin^(4)(pi/8)+cos^(4)((3 pi)/8)+sin^(4)((5pi)/8)+cos^(4)((7pi)/8) is equal to =

"sin"^(4)pi/8" +sin"^(4)(3pi)/8" +sin"^(4)(5pi)/8" +sin"^(4)(7pi)/8=

Find the value of cos^(4)((pi)/(8))+cos^(4)((3pi)/(8))+cos^(4)((5pi)/(8))+cos^(4)((7pi)/(8)) .

Prove that: cos^(4)(pi)/(8)+cos^(4)(3 pi)/(8)+cos^(4)(5 pi)/(8)+cos^(4)(7 pi)/(8)=(3)/(2)

The value of cos(pi)/(8)cos(3 pi)/(8)cos(5 pi)/(8)cos(7 pi)/(8) is equal to