Answer:
x
=
−
20
1
2
Isolate the variable by dividing each side by factors that don't contain the variable.
Alright, lets get started.
Please take a look at the diagram attached.
The reference angle of 75 will be 75
As it is mentioned that the angle intersects the unit circle means r = 1
So, finding cos
cos 75 = 
cos 75 = 
cos 75 = 0.259 : Answer
Hope it will help :)
B is true because 0-(-x) = 0 + x = x