Buku Sukino
Matematika Peminatan
Kelas XII
Kunci Jawaban BAB 3
LKS 1
Bagian B. Evaluasi Pemahaman dan Penguasaan Materi
3. Hitunglah besar kemiringan garis tangen dari kurva berikut.
a. f(θ) = sin θ / (1 + cos θ) di θ = π/3
b. g(x) = (16 + sin x) / (3 + sin x) di x = π/6
Jawaban :
a. f(θ) = sin θ / (1 + cos θ) di θ = π/3
u = sin θ
u ' = cos θ
v = 1 + cos θ
v ' = - sin θ
f ' (θ) = (u ' v - v ' u) / v2
f ' (θ) = (cos θ . (1 + cos θ) - (- sin θ). sin θ) / (1 + cos θ)2
f ' (θ) = (cos θ + cos2 θ + sin2 θ) / (1 + cos θ)2
f ' (θ) = (cos θ + 1) / (1 + cos θ)2
f ' (θ) = 1 /(cos θ + 1)
f ' (π/3) = 1 /(cos π/3 + 1)
f ' (π/3) = 1 /(1/2 + 1)
f ' (π/3) = 1 /(3/2)
f ' (π/3) = 2/3
b. g(x) = (16 + sin x) / (3 + sin x) di x = π/6
u = 16 + sin x
u ' = cos x
v = 3 + sin x
v ' = cos x
g ' (x) = (u ' v - v ' u) / v2
g ' (x) = (cos x . (3 + sin x) - cos x(16 + sin x)) / (3 + sin x)2
g ' (x) = (3 cos x + sin x cos x - 16 cos x - sin x cos x) / (3 + sin x)2
g ' (x) = (3 cos x - 16 cos x) / (3 + sin x)2
g ' (x) = (- 13 cos x) / (3 + sin x)2
g ' (π/6) = (- 13 cos π/6) / (3 + sin π/6)2
g ' (π/6) = (- 13 . 1/2√3) / (3 + 1/2)2
g ' (π/6) = (- 13/2√3) / (7/2)2
g ' (π/6) = (- 13/2√3) . 4/49
g ' (π/6) = - 13√3 . 2/49
g ' (π/6) = - 26/49 √3
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>> bag B no 4
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