October 2018 1 72 Report
Jika diketahui nilai tan  20^{o} = a maka
nilai  \frac{ tan 40^{o} + tan 25^{o} }{1 - tan 40^{o} . tan 25^{0}} = . . . .
A.  \frac{2a}{1-a^{2}}
B. \frac{1 - a ^{2}}{1+a^{2}}
C. \frac{1 + a ^{2}}{1 - a^{2}}
D.  \frac{1 - a }{1+a}
E.  \frac{1 + a }{1 - a}

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