November 2019 1 36 Report
1.dik segitiga PQR dgn P(1,-1,-2),Q(4,3,-1)
dan R(2,-3,a).besar sudut PQR....

2.Dik:titik A(3,2,-1),B(2,1,0) dan c(-1,2,3)
kosinus sudut antara AB dan AC

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