Tentukan nilai f'(π/4) jika f(x) = sec 3x
Tentukan nilai f'(π/4) jika f(x) = sec 3x!
Jawab:
f(x) = sec 3x
f'(π/4) = …. ?
Kita lakukan perhitungan seperti berikut.
f'(x) = 3 . sec 3x tan 3x
f'(π/4) = 3 . sec 3(π/4) tan 3(π/4)
= 3 . sec 3π/4 tan 3π/4
= 3 . (-√2) . (-1)
f'(π/4) = 3√2
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