Jika f(x) = 2 cos x + sec x, tentukan nilai f'(π/4)
Jika f(x) = 2 cos x + sec x, tentukan nilai f'(π/4)!
Jawab:
Kita lakukan perhitungan seperti berikut:
f(x) = 2 cos x + sec x
f'(x) = -2 sin x + sec x tan x
f'(π/4) = -2 sin (π/4) + sec (π/4) tan (π/4)
= -2 × (½√2) + √2 × 1
= -√2 + √2
f'(π/4) = 0
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