Question

find a and b if limit exists

Answer 1

limit at x approaching to 0

put x= 0 in ax.x+ b
= b
put x=0 in cosx
so b=1

limit at x =-1

put x= -1 in a x.x + b
= a+b
at x= 1 it's 4
so a+b=4
as b=1
SO A= 3