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

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

(cos^(2)pi)/(8)+(sin^(2)(3 pi))/(8)+(sin^(2)(5 pi))/(8_(sin)^(2))(7 pi)/(8)=2

4.Prove that sin^(2)((pi)/(8))+sin^(2)((3 pi)/(8))=1

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

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

Prove (i) "sin"^(2)(pi)/(8)+"sin"^(2)(3pi)/(8)+"sin"^(2)(5pi)/(8)+"sin"^(2)(7pi)/(8)=2 (ii) [1+cotalpha-sec((pi)/(2)+alpha)] [1+cotalpha+sec((pi)/(2)+alpha)]=2cotalpha

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

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