A particle moves according to the law x=a "cos"(pit)/2. The distance covered by it in the time interval between t=0 to t=3 sec is

A particle moves according to the law x=a "cos"(pit)/2. The distance c

1.	A particle moves according to the law x=a "cos"(pit)/2. The distance covered by it in the time interval between t=0 to t=3 sec is
Answer» 2a 3a 4a a Answer :B