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kelas x
tentang trigonometri
jawab
ket:
cos 0°= 1
sin 90°=1
cotan 90° = 0
jadi
3 cos 0°-3 sin 90° × 4 cotan 90°
(3×1)-(3×1)×(4×0)=3-3×0=0
jadi jawabannya 0