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zloy xaker [14]
3 years ago
7

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

Mathematics
1 answer:
Natalija [7]3 years ago
3 0

Answer: The first option.


Step-by-step 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(-\frac{9\pi}{2})\neq2cot(\frac{9\pi}{2})

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

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\bf \textit{Law of Cosines}\\ \quad \\
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