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y+sin80^(@)quad (xiv)quad cos(pi)/(5)+co...

y+sin80^(@)quad (xiv)quad cos(pi)/(5)+cos(2 pi)/(5)+cos(6 pi)/(5)+cos(7 pi)/(5)=0

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The value of cos(pi)/(5)cos.2(pi)/(5)cos4(pi)/(5)cos8(pi)/(5)=

cos(pi/5)cos((2pi)/5)cos((4pi)/5)cos((8pi)/5)=

The value of cos (pi)/(5) . cos (2 pi)/(5). cos (4 pi)/(5) . cos (8 pi)/(5) is

cospi/5+cos(2pi)/5+cos(6pi)/5+cos(7pi)/5=0

cos ((pi) / (8)) cos ((3 pi) / (8)) cos ((5 pi) / (8)) cos ((7 pi) / (8)) =

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cos ^(2) (3 pi)/(5)+cos ^(2) (4 pi)/(5)=

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

Prove that: cos(pi/5)cos((2pi)/5)cos((4pi)/5)cos((8pi)/5)=(-1)/16

cos^(2)((3 pi)/(5))+cos^(2)((4 pi)/(5))=