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Sudut antara dua garis
Author:
Untung Trisna S.
Ambil cosinus arah garis
yaitu
, dan cosinus arah garis
yaitu
. Tentukan titik
dan
.
sejajar
, dan
sejajar
(mengapa?)
,
(mengapa?) Sudut antara garis
dan
sama dengan
.
Buktikan bahwa
.
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