calculus question

Question

What is one identity you could use to convert the LHS: csc θ cos θ to cot θ

1. 1/cos θ = csc θ

2. 1/csc θ = cos θ

3. 1/sin θ = csc θ

4. 1/tan θ = cot θ

Answer 1

csc x * cos x = cot x

(1/sin x) * cos x = cot x

cos x/ sin x = cot x

ANSWER: 3.