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jika u = x²-2x ---> u' = 2x-2
v = x-3 ----> v'= 1
sehingga
4. jika absis -5,
pers garis singgung y = mx + c
y = 85x + c
-144 = 85(-5)+c
c = -144+425
= 281
y = 85x + 281