Question

Cos θ / 1-sin θ = 1+sin θ / cos θ

Answer 1

cosФ/1-sinФ= cosФ/1-sinФ X 1+sinФ/1+sinФ = cosФ(1+sinФ)/1-sin²Ф=1+sinФ/cosФ  (1-sin²Ф = Cos²Ф)