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Prove that: (i)"sin"^(2)24^(@)-"sin"^(...

Prove that:
(i)`"sin"^(2)24^(@)-"sin"^(2)6^(@)=(1)/(8)(sqrt(5)-1)`
(ii)`"tan"9^(@)-"tan"27^(@)-"tan"63^(@)+"tan"81^(@)=4`.

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