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[" 7."sin^(2)((pi)/(18))+sin^(2)((pi)/(9...

[" 7."sin^(2)((pi)/(18))+sin^(2)((pi)/(9))+sin^(2)((pi)/(18))+sin^(2)((4 pi)/(9))=quad " .MTR "],[[" (a) "1," (b) "2," (c) "4," (d) N.O.T."]]

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

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

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

sin^(2)(pi)/(4)+sin^(2)(3 pi)/(4)+sin^(2)(5 pi)/(4)+sin^(2)(7 pi)/(4)=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)(7 pi))/(18)+(sin^(2)(4 pi))/(9)=2

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

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