Question

If cot θ=78, evaluate: (1+sin θ)(1- sin θ)/(1+cosθ)(1-cosθ)

Answer 1

Answer:

49/64 or 6084

Step-by-step explanation:

= > (1+sin θ)(1- sin θ)/(1+cosθ)(1-cosθ)

= > (1 - sin²θ ) / (1 - cos²θ )

1 - sin²A = cos²A ; 1 - cos²A = sin²A

= > cos²θ / sin²θ

= > cot²θ

= > (7/8)² or 78²

= > 49/64 or 6084