Trigonometri
*
misalkan tinggi menara t = x + y
y = t - x
1) tan α = t /a --> a = t / tan α
2) tan β = y/a --> a = y/ tan β = (t - x) / tan β
1) = 2)
t / tan α = (t - x) / tan β
t tan β = (t - x) tan α
x tan β = t tan α - x tan α
x tan β + x tan α = t tan α
x (tan β + tan α) = t ,tan α
x = t. tan α/ (tan α +tan β)
dngan t = tinggi menara
2. P(t) = 60 + 40 cos ( πt/3)
tahun 2019 --> t = 2019- 2016 = 3
p(3) = 60 + 40 cos (3π/3) = 60 + 40 cos π
p(3) = 60 + 40 (-1)
p(3) = 60 - 40
p(3) = 20
tahun 2022 --> t = 2022- 2016 = 6
p(6) = 60 + 40 cos (6π/3)
p(6) = 60 + 40 cos (2π)
p(6) = 60 + 40(1)
p(6) = 100
******
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Trigonometri
*
misalkan tinggi menara t = x + y
y = t - x
*
1) tan α = t /a --> a = t / tan α
2) tan β = y/a --> a = y/ tan β = (t - x) / tan β
1) = 2)
t / tan α = (t - x) / tan β
t tan β = (t - x) tan α
x tan β = t tan α - x tan α
x tan β + x tan α = t tan α
x (tan β + tan α) = t ,tan α
x = t. tan α/ (tan α +tan β)
dngan t = tinggi menara
2. P(t) = 60 + 40 cos ( πt/3)
tahun 2019 --> t = 2019- 2016 = 3
p(3) = 60 + 40 cos (3π/3) = 60 + 40 cos π
p(3) = 60 + 40 (-1)
p(3) = 60 - 40
p(3) = 20
*
tahun 2022 --> t = 2022- 2016 = 6
p(6) = 60 + 40 cos (6π/3)
p(6) = 60 + 40 cos (2π)
p(6) = 60 + 40(1)
p(6) = 100
******