Q4. For the initial value problem y′=y,y(0)=1,R:∣x∣≤1,∣y−1∣≤1
a) A solution exists and unique in at least ∣x∣≤1/2
b) A solution exists and unique in at least ∣x∣<1/2
c) A solution exists and unique in at least ∣x∣>1/2
d) A solution exists and unique in at least ∣x∣≥1/2