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

[" 15.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]],[," (i) "(1)/(tan^(4)A)+(1)/(tan^(2)A)=1]

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