Question

y = cos2A +cos2B
A=0,B=60​

Answer 1

Answer:

If y=cos2A+cos2B

then y= cos0+cos120

y= 1+(-1/2)

y=1/2

Answer 2

Answer:

y=cos2A+cos2B

y=cos 0 + cos 120

y= 1+(-1/2)

y= 1/2