Plz give ans of limit sitAfter solving this I don`t get answers p lz .. sir as soon as possible give me ans

In 5 th qstn...1st part?..

Put tan inverse x =t then (1/1+x*2).dx =dt and change its limts...then integral 0 to pie/2  sint.dt....on solving you will the ans. that is 1....

 For the 2nd part,directly apply By Parts ILATE condition....you will get the ans...