Find the approximated integral value using Left endpoint approximation

x	f(x)
0.0	1.0000
0.1	0.9975
0.2	0.9900
0.3	0.9776
0.4	0.8604

Solution:
The value of table for `x` and `f(x)`

`x`	`f(x)`
`x_0=0`	`f(x_(0))=1`
`x_1=0.1`	`f(x_(1))=0.9975`
`x_2=0.2`	`f(x_(2))=0.99`
`x_3=0.3`	`f(x_(3))=0.9776`
`x_4=0.4`	`f(x_(4))=0.8604`

Method-1:
Using Left endpoint approximation (Left Riemann Sum)


`int f(x) dx=Delta x xx(f(x_(0))+f(x_(1))+f(x_(2))+f(x_(3)))`

`=0.1xx(1+0.9975+0.99+0.9776)`

`=0.1xx(3.9651)`

`=0.3965`

Solution by Left endpoint approximation (Left Riemann Sum) is `0.3965`

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