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Parabola.Dengan menggunakan konsep turunan. Dalam hal ini menggunakan turunan implisit.
y² = 2px
2y dy/dx = 2p
dy/dx = p/y dimana dy/dx = m
y - y₁ = m(x - x₁)
y - y₁ = p/y (x - x₁)
y² - y₁y = p(x - x₁)
2px - y₁y = px - px₁
2px - px + px₁ = y₁y
y₁y = p(x + x₁)