Plz solve this

99. The integral equation px)-2 [cos[r(x-1)]p()dt= s(a) has 1. a unique solution for. 21 when f(x)=r. 2 no solution for 2l when fr)=l. 3. 1O solution for 2=l when (x)=r. 4 1nfinite number of solutions for -l when f(r)=!.