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sin a = 6/10 cos a = 8/10 tan = 6/8
akar -3^2 - 4^2 = akar 9+ 16=akar25=5
sin b = -3/5 tan b = -3/4 cos b = 4/5
cos a + sin b = 8/10 + -3/5 = 1/5
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