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= (4x² - 2x)^½
Untuk menentukan f'(x), maka gunakan aturan rantai
f'(x) = ½ (4x² - 2x)^-½ • (8x - 2)
½ • (8x - 2)
f(x) = __________
(4x² - 2x)^½
4x - 1
f(x) = _________
√(4x² - 2x)
4(1) - 1
f(1) = ___________
√(4(1)² - 2(1))
4 - 1
f(1) = _________
√(4 - 2)
f(1) = 3/√2
f(1) = ³/₂√2
Jadi, nilai dari f'(1) = ³/₂√2