Question

answer is y=cos 3x but how?? plzz plzz explain it, it is very urgent.. it's a kind request​

Answer 1

Answer:

as see, I guess as the all angles which we are getting on the x-axis are the multiple of 3 like 30, 60, 90, etc

so I guess this Ithe reason that the equation is mentioned y=cos 3x{as here the 3 represents that all the angles are the multiple or factor of 3}

KINDLY MARK AS BRAINLIEST