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[" If "sin^(4)A+sin^(2)A=1" ,prove that:...

[" If "sin^(4)A+sin^(2)A=1" ,prove that: "],[[" (i) "(1)/(tan^(4)A)+(1)/(tan^(2)A)=1," (ii) "tan^(4)A-tan^(2)A=1],[" tand "(1)/(ln2)," (a) "(1)/(2)]]

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