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[" (4) "3$11" 63- "],[" (i) "(cos9^(0)+s...

[" (4) "3$11" 63- "],[" (i) "(cos9^(0)+sin9^(@))/(cos9^(@)-sin9^(@))=tan54^(@)],[" (ii) "Cos20^(@)Cos40^(@)Cos60^(@)Cos80^(@)=(1)/(16)]

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(cos9^(@)+sin9^(@))/(cos9^(@)-sin9^(@))=tan54^(@)

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