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cosA.cosB + sinA.sinB = 3/5
7/5 + sinA.sinB = 3/5
sinA.sinB = 3/5-7/5
sinA.sinB = -4/5
⇒tanA.tanB = sinA.sinB : cosA.cosB
= -4/5 : 7/5
= -4/7
dtw salah
insya allah bnr