January 2019 1 15 Report
Soal trigonometri kelas xi mohon bantu...

1.) Nilai dari
sin105°-sin15°/cos75°-cos 15° adalah....
2.) Diketahui a-b = π/6 dan sin a sin b =1/2 dengan a dan b merupakan sdut lancip. nilai cos (Alfa + Beta ) adalah...
a. -1/2
b. -√3/2
c. √3/2
d. 1/2
e. 1/4

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