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) .
(2x-3)(5x+9)
2x*5x-3*9
10x-27
Answer:
x =
or
Step-by-step explanation:
- Write it out:
- So, x equals
or 
I hope this helps!
C. Never
This is because they should be parallel if the are two separate rays.