Yes subtracting is taking away from another. 5-3 is two because you take 3 away from 5.
Answer:
B=42° and C=138°
Step-by-step explanation:
Given:
The trigonometric equation is:

To find:
The solutions for the given equation over
.
Solution:
We have,

It can be written as


and 
The solutions over
are:
and 
and 
Therefore, the correct option is D.
please refer to above attachment ↑↑