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cos A=4/5
tan A=3/4
sin A = 1/cosec A = 1/(5/3) = 1 . 3/5 = 3/5
cos A = sisi samping / sisi miring = 4/5 =====> sisi depan = 3
sisi samping = 4
sisi miring = 5
( triple phytagoras)
tan A = sin A / cos A = 3/5 / 4/5 = 3/5 . 5/4 = 3/4