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misal p = ax - 2a
p' = a
q = √(2x) - x
q' = 1/√(2x) - 1
untuk x = 2 --> q' = 1/2 - 1 = 1/2
p'/q' = 4 untuk x = 2
a/ (1/2) = 4
a = 4(1/2)
a = 2