Kuadran I
cos A = 4/5 → x/r
y = √(r² - x²)
y = √(5² - 4²)
y = √(25 - 16)
y = √9
y = 3
sin A = 3/5
sin 2A
= 2 . sin A . cos A
= 2 . 3/5 . 4/5
= 24/25
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Kuadran I
cos A = 4/5 → x/r
y = √(r² - x²)
y = √(5² - 4²)
y = √(25 - 16)
y = √9
y = 3
sin A = 3/5
sin 2A
= 2 . sin A . cos A
= 2 . 3/5 . 4/5
= 24/25