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[" Show that: "],[[" (i) "cos^(2)(pi)/(8...

[" Show that: "],[[" (i) "cos^(2)(pi)/(8)+cos^(2)(3 pi)/(8)+cos^(2)(5 pi)/(8)+cos^(2)(7 pi)/(8)=2]]

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

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

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

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Prove that cos((pi)/(8))+cos((3 pi)/(8))+cos((5 pi)/(8))+cos((7 pi)/(8))=0