kaka bantu semoga bisa

sin A = depan/miring
cos A = samping/miring

#maaf jika salah semoga membantu

sin A = 3/5 atau depan/miring

cari samping²= miring²-depan²
samping² = 5²-3²
samping² = 25 - 9
samping = √16
samping = 4

jadi cos A = samping/miring
cos A = 4/5