Dennis has 5 fish. 2 of the fish are orange and the rest are blue. How many blue fish does Dennis have?
2 answers:
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The answer should be ( 2x + 6) (2x - 6) By proving through expansion:
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:
3. So, you can coclude that the first step is wrong. Therefore, the answer is the first option.