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[sin^(2)160^(@)+sin^(2)140^(@)+sin^(2)10...

[sin^(2)160^(@)+sin^(2)140^(@)+sin^(2)100^(@)=],[[" 1) "(1)/(2)," 2) "(3)/(2)," 3) "(5)/(2)," 4) "(7)/(2)]]

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sin^(2) 20^(@) + sin^(2) 100^@ + sin^(2) 140^(@) =

sin^(2)22^(@)+sin^(2)38^(@)+sin22^(@) sin38^(@)=

sin 40^(@) - sin 80^(@)+ sin 160^(@) =

sqrt(1-sin^(2)100^(@))*sec 100^(@)=

(sqrt(1-sin^(2)100^(@)))sec100^(@)=

sin100^(@)sqrt(1+cot^(2)100^(@)) =

Sin40^(@) - Sin80^(@) + Sin160^(@) =

sin^(2)20^(@)+cos^(2)160^(@)-tan^(2)45^(@) =__________

S.T cos340^(@) . Cos40^(@)+sin200^(@).sin140^(@)=(1)/(2)