Consider the power series of the function
.
.
In general, using additional terms provides an approximation that is closer to the actual value of
.
Consider the fourthpartial sum of
. \ \

Similarly, consider the fifth partial sum of
.

Similarly, consider the sixth partial sum of
.

Using a calculator, the value of
is
. \ \
Therefore, as the number of terms increases, the approximation approaches the actual value of
for different values of
.
As the number of terms increases, the approximation approaches the actual value of
for different values of
.