Question: Evaluate $f(n)(x)$ for integer values $ofn$ from $0to9$ where $f(x)=cosxat$

$x=0.$

Anonymous results will $be$ published after you answer.

$1,0,-1,0,1,0,-1,0,1,0$

$0,-1,0,1,0,-1,0,1,0,-1$

$-1,0,1,0,-1,0,1,0,-1,0$

$0,1,0,-1,0,1,0,-1,0,1$