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what is the answer too (2 tan 4°)/(1 - tan2 4°)?! please help

please help i can't figure it out!
 
as well as
 
(2 tan 4θ)/(1 − tan2 4θ)

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Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...
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2 tan 4Θ/ ( 1 - tan 2 4 Θ ) = Tan 8θ
 
 This is formula for Tan twice the angle