Buku Sukino
Matematika Peminatan
Kelas XII
Bab Aplikasi Turunan
TUPOK 1
18. Persamaan garis normal dari kurva h(t) = - cosec t pada titik berabsis t = -π/6 adalah ...
a. x + π/6 = 2√3 (y - 2)
b. y - 2 = 2√3 (x + π/6)
c. y - 2 = √3 (x + π/6)
d. x + π/6 = √3(2 - y)
e. x + π/6 = 2√3 (2 - y)
Jawaban : E
h(t) = - cosec t
h' (t) = cosec t cot t
gradien :
h' (t) = cosec t cot t
h' (-π/6) = cosec (-π/6) cot (-π/6)
m = -2 . -√3
m = 2√3
gradien garis normal = - 1/ 2√3
θ = -π/6
h(-π/6) = - cosec (-π/6)
h(-π/6) = 2
(-π/6, 2)
y - y1 = gradiennormal (x - x1)
y - 2 = - 1/ 2√3 √3 (x + π/6)
- 2√3( y - 2) = x + π/6
2√3 (2 - y) = x + π/6
x + π/6 = 2√3 (2 - y)
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