February 2019 1 29 Report
1. Jika α + β = 600° dan cos α cos β = 1/3
maka tentukan cos(α - β)
a. 1/2 b. 1/3 c. 1/6 d. -1/6 e. -1/3



2. Jika cos 6α + cos 3α = m dan
sin 6α + sin 3α = n , maka tentukan
nilai m² + n²

a. 2 + 2cos9α
b. 2 + 2cos3α
c. 2 + 2sin3α
d. 2 + 2cos3α sin6α
e. 2 + 2cos6α sin3α


Mohon diselesaikan dengan cara ya...
terima kasih


@Wello1



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