Prove that (4 cos^(2)9^@-3) (4 cos^(2)7^...

Prove that `(4 cos^(2)9^@-3) (4 cos^(2)7^@-3) = tan9^@`

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Prove that (4cos^(2)9^(@)-3)(4cos^(2)7^(@)-3)=tan9^(@)

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