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.
Answer:
6
Step-by-step explanation:
1800/300=6
23.
2/5 + 1/2
you find the common denominator
which is 10
4/10 + 5/10
you add the fractions
9/10
he has completed 9/10 of the questions in the first 25 minutes
9514 1404 393
Answer:
>180° (more than 180°)
Step-by-step explanation:
Angles are classified as ...
- acute: < 90°
- right: = 90°
- obtuse: > 90°
- straight/linear: = 180°
- reflex: > 180°
It seems that we're looking at definitions:
obtuse : >90° :: reflex : >180°