Answer:
maybe it's D ( not sure tho)
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
Its A. the side lengths squared equal the hypotenuse squared.
the answer is d the image is the same size
