DIK = COS A = 3/4, DAN A DI JUADRAT KE IV
TENTUKAN NILAI SIN A=.
TENTUKAN NILAI SIN A=.
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depan² = miring² - samping²
depan² = 4² - 3²
depan² = 7
depan = √7
sin A = depan/miring
sin A = √7/4
karena di kuadran 4, sin bernilai negatif
jadi, sin A = - √7/4
semoga jelas dan membantu :)