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[5.40],[" 4.Prove that ":sin^(2)(pi)/(18...

[5.40],[" 4.Prove that ":sin^(2)(pi)/(18)+sin^(2)(pi)/(9)+sin^(2)(7 pi)/(18)+sin^(2)(4 pi)/(9)=2],[(5 pi]

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Prove that "sin"^(2)(pi)/(18)+"sin"^(2)(pi)/(9)+"sin"^(2)(7pi)/(18)+"sin"^(2)(4pi)/(9)=2 .

Prove that, sin^(2)((pi)/(18))+sin^(2)((pi)/(9))+sin^(2)((7pi)/(18))+sin^(2)((4pi)/(9))=2

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

Show that sin^(2)""(pi)/(18) + sin^(2)""(pi)/(9) + sin^(2)""(7pi)/(18) + sin^(2)"" (4pi)/(9) = 2 .

Prove that: sin^2(pi/(18))+sin^2(pi/9)+sin^2((7pi)/(18))+sin^2((4pi)/9)=2

Prove that sin^2(pi/18)+sin^2(pi/9)+sin^2(7pi/18)+sin^2(4pi/9)=2

The value of (sin^(2)(pi)/(10)+sin^(2)(4 pi)/(10)+sin^(2)(6 pi)/(10)+sin^(2)(9 pi)/(10)) is

Prove that, cos^(2) (pi/4) + sin^(2) (3pi/4) + sin^(2) (5pi/4) + sin^(2)(7pi/4) = 2 .

Prove that: sin^2pi/(18)+sin^2pi/9+sin^2(7pi)/(18)+sin^2(4pi)/9=2