Question

Sandra wants to evaluate 2 cot Her work is shown below. What did she do wrong?

Answer 1

Answer: The first option.

Explanation:

1. To solve this exercise you need to remember that:

- An even function is a function with the following property:

f(-x)=f(x)

- An odd function is a function with this property:

f(-x)=-f(x)

2. By definition, the contangent is an odd function, therefore you have that:

cot(-θ)=-cot(θ)

Then:

`2cot(-(9\pi)/(2))\\eq2cot((9\pi)/(2))`

3. So, you can coclude that the first step is wrong. Therefore, the answer is the first option.