Kelas XII
Sukino Kelas XII
Kunci Jawaban Matematika Kelas XII Peminatan
Bab 2 Turunan Fungsi Trigonometri
RUKO 2
Bag A
28. Diketahui f(x) = √(x2 -√(x2 + 1)). Ekspresi f(x) berbentuk ...
a. 1/ √(x2 -√(x2 + 1)) - 1/√(x4 - 1)
b. 1/ √(x2 -√(x2 + 1)) - 1/√(x4 - 1)
c. x{1/ √(x2 -√(x2 + 1)) - 1/√(x4 - 1)}
d. x{1/ √(x2 -√(x2 + 1)) - 1/2√(x2(x2 + 1)-(x2 + 1)√x2+1)}
e. x{1/ √(x2 -√(x2 + 1)) + 1/2√(x2(x2 + 1)-(x2 + 1)√x2+1)}
Jawaban : D
misalkan
u = x2
du/dx = 2x
v = x2 -√(x2 + 1)
v = u -√(u + 1)
dv/du = 1 - 1/2 (u + 1)-1/2
y = √(x2 -√(x2 + 1))
y = √v
dy/dv = 1/2 v-1/2
dy/dx = dy/dv . dv/du . du/dx
dy/dx = 1/2 v-1/2. (1 - 1/2 (u + 1)-1/2 ) . 2x
1 1
dy/dx = x . ------ . (1 - ------------------)
v1/2 2 (u + 1)1/2
1 1 1
dy/dx = x .( ------ - ----- -----------------)
v1/2 v1/2 2 (u + 1)1/2
1 1
dy/dx = x .( ---------------------- - -------------------------------------)
√(x2 -√(x2 + 1)) √(x2 -√(x2 + 1)) . 2 (x2 + 1)1/2
1 1
dy/dx = x .( ---------------------- - -------------------------------------------)
√(x2 -√(x2 + 1)) 2√(x2 (x2 + 1) - (x2 + 1)√(x2 + 1))
dy/dx = x{1/ √(x2 -√(x2 + 1)) - 1/2√(x2(x2 + 1)-(x2 + 1)√x2+1)}
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