$1.$ Implement a revised version of Program $3\mathrm{.}2$: Trapezoidal rule of

calculating the definite integral $()\text{'}$

$($ such that the users can have

their input, note that $()$ is a function hardcoded in your program.

INPUT: b $$ the upper bound of the interval;

a $$ the lower bound of the interval;

n $$ the number of subintervals $($trapezoids$).$

OUTPUT: The value of $()\text{'}$

$(.$

$2.$