If I=x∫02t2[t]dt,x∈R+, where [⋅] denotes the greatest integer function, then the value of I is
Open in App
Solution
Let x∈[n,n+1),n∈I
Now, I=x∫02t2[t]dt⇒I=x∫02{t}dt⇒I=n∫02{t}dt+x∫n2{t}dt⇒I=n1∫02{t}dt+x∫n2{t}dt⇒I=n1∫02tdt+x∫n2t−ndt⇒I=n[2tln2]10+[12n2tln2]xn⇒I=nln2+12nln2(2x−2n)⇒I=nln2+1ln2(2x−n−1)∴I=[x]+2{x}−1ln2