Answer:
B
Step-by-step explanation:
Answer:
2^2×20
Step-by-step explanation:
2^2×20
because 2×20=40
so, 2^2×20=2^40
<span>15.1, 15.2, 15.3
-</span>Lucy ☃︎
Answer: The first option.
Step-by-step explanation:
1. 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 the following 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})](https://tex.z-dn.net/?f=2cot%28-%5Cfrac%7B9%5Cpi%7D%7B2%7D%29%5Cneq2cot%28%5Cfrac%7B9%5Cpi%7D%7B2%7D%29)
3. So, you can coclude that the first step is wrong. Therefore, the answer is the first option.