what is ur doubt kindly explain more? its simple lebniz theoram used.. @Hritik_2020
How modulus t is opened @Sneha_2021
if t>0 then + otherwise t<0 then -ve
How it depends on the x? Why when x is positive we have taken t as positive and when x is negative t is negative?
because t depend on x as by given limit
Got it, thanks