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[" 4.The value of "sin^(2)5^(@)+sin^(2)1...

[" 4.The value of "sin^(2)5^(@)+sin^(2)10^(@)+sin^(2)15^(@)+sin^(2)],[qquad [20^(@)+...+sin^(2)90^(@)" is "-],[[" (A) "7," (B) "8],[" (C) "9," (D) "(19)/(2)]]]

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