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Verified answer
Bab TrigonometriMatematika SMA Kelas X
sin A = 2/5 . √5
= 2/√5 → y/r
x = √(r² - y²)
= √((√5)² - 2²)
= √(5 - 4)
= √1
= 1
tan A = y/x
= 2/1
= 2