Answer:Convenience sampling
Step-by-step explanation:
This type of sample refers to convenience sampling or grab sampling or accidental sampling.
Convenience sampling is a non-probability type sampling that includes the population which is nearby or available in your zone.
This type of sampling is handy when you need to know about a particular data in less time .Although the result may be somewhat biased because of a certain type of population may exist close to you.This method is most useful for Pilot testing.
The question is related to trigonometry and we have to use the formula of double angle .
Here we use double angle formula of tangent function which is
Given expression is
Comparing it with double angle formula, we will get x = 5
SO the required expression is equal to
So the answer is tan(10) .
I believe the answer is 4
