Kelas XII
Sukino Kelas XII
Kunci Jawaban Matematika Kelas XII Peminatan
Bab 2 Turunan Fungsi Trigonometri
RUKO 2
Bag A
20. Jika h(θ) = sin θ / (sin θ + cos θ) , maka h ' (π/2) sama dengan ...
a. -2
b. -1
c. 0
d. 1
e. 2
Jawaban : D
h(θ) = sin θ / (sin θ + cos θ)
u = sin θ
u ' = cos θ
v = sin θ + cos θ
v ' = cos θ - sin θ
cos θ . (sin θ + cos θ) - sin θ . (cos θ - sin θ)
h(θ) = ------------------------------------------------------
(sin θ + cos θ)2
cos θ . sin θ + cos2 θ - sin θ . cos θ + sin2 θ
h(θ) = ------------------------------------------------------
sin2 θ + cos2 θ + 2 sin θ . cos θ
cos2 θ + sin2 θ
h(θ) = ---------------------------------------
sin2 θ + cos2 θ + 2 sin θ . cos θ
sifat : sin2 θ + cos2 θ = 1
1
h(θ) = -----------------------
1 + 2 sin θ . cos θ
sifat : sin 2A = 2 sin A cos A
1
h(θ) = --------------
1 + sin 2θ
1
h(π/2) = --------------
1 + sin 2.π/2
1
h(π/2) = ------------
1 + sin π
1
h(π/2) = --------
1 + 0
h(π/2) = 1/1 = 1
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