Answer:
B
Step-by-step explanation:
A statement that has mathematical expressions that are equal.
Examples:
2+1=3
11x4=44
15) factor out cos: cos(x)(sin(x)+1)=0
Now this is true when either cos(x)=0 (x=pi/2 and 3pi/2)
Or when sin(x)=-1 (x=3pi/2)
So it's solutions are pi/2 and 3pi/2