September 2018 1 29 Report
Untuk 0 ≤ x < π dan 6 tan^2 x + tan x – 1 = 0, nilai cos x adalah …
A. {(3√10)/10,(2√5)/5}
B. {(3√10)/10,(-2√5)/5}
C. {(-3√10)/10,(2√5)/5}
D. {(-√10)/10,√5/5}
E. {√10/10,√5/5}

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