Answer:
steps
Step-by-step explanation:
1 - sin²θ / (1 - cosθ) = 1 - (1 - cos²θ) /(1 - cosθ)
= 1 - (1 + cosθ)(1 - cosθ) /(1 - cosθ)
= 1 - (1 + cosθ)
= - cosθ
