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[" 68.If "S=1+sin^(2)theta+sin^(4)theta+...

[" 68.If "S=1+sin^(2)theta+sin^(4)theta+...oo," then the value of "S" is "],[[" (a) "1," (b) "0," (c) "cos^(2)theta," (d) "sec^(2)theta]]

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