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Berlaku turunan untuk menentukan laju fungsi:
f'(x) = 1/2 x^(-½) + 1
Untuk x = 4, laju perubahan fungsinya adalah:
f'(4) = 1/2. 4^(-½) + 1
f'(4) = 1/2. 1/2 + 1
f'(4) = 5/4