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sinA = negatif
cosA = negatif
tanA = positif
cos = samping / miring
samping = 4
miring = 5
depan = √5² - 4²
= √25 - 16
= √9
= 3 satuan panjang
depan = 3
samping = 4
miring = 5
sinA + tanA = - depan / miring + depan / samping
= -3/5 + 3/4
= -12/20 + 15/20
= 3/20