sin(pi)/(8)

sin^4(pi/8)+sin^4((2pi)/8)+sin^4((3pi)/8)+sin^4((4pi)/8)+sin^4((5pi)/8)+sin^4((6pi)/8)+sin^4((7pi)/8)=

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

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

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

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

Prove any of the following sin^2(pi/8)+sin^2(3pi/8)+sin^2(5pi/8)+sin^2(7pi/8)=2

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

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

Prove that: sinpi/7+sin(2pi)/(7) + sin(8pi)/7 + sin(9pi)/7=0