① (x - 1)/2 = -cosθ ~ (i)
y + 2 = -sinθ ~ (ii)
(i)² + (ii)²:[(x - 1)/2]² + (y + 2)² = (-cosθ)² + (-sinθ)² (sin²θ + cos²θ = 1)
(x - 1)²/4 + (y + 2)² = 1
② (x - 2)/4 = tanθ ~ (iii)
(y + 1)/3 = secθ ~ (iv)
(iv)² - (iii)²: [(y + 1)/3]² - [(x - 2)/4]² = secθ² - tanθ² (1 + tan²θ = sec²θ)
-(x - 2)²/16 + (y + 1)²/9 = 1
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