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sisi samping 12, sisi miring 13, sisi depan 5
tan a = -5/12 (krn kuadran 4 nilai -)
2. tan a = 3/4
sisi depan 3, sisi samping 4, sisi miring 5
sin a = 3/5
3. diket tan a ditanya tan a salah tulis soal
4. cos b = -12/13
sisi samping 12, sisi miring 13, sisi depan 5
sin b = -5/13 (kuadran 3)