September 2018 1 30 Report
4. Jika untuk 0 ≤ a , β ≤ π , berlaku √3 tanα tanβ = tanα - tanβ -√3
dan sinαsinβ = 3/4 maka cos (α+β) = ....

a. 0
b. 1/2√3
c. -1
d. 1
e. 1/2√2
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