4 Find the values of answers obtained in (3) at the given limits of integral and find
the difference of the values at the upper and lower limits �Note In order to quicken this method, we can proceed as follows: After
performing steps 1, and 2, there is no need of step 3 Here, the integral will be kept
in the new variable itself, and the limits of the integral will accordingly be changed,
so that we can perform the last step