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## Homework Statement

Using the Arctangent formula

pi = 16 * arctan (1 / 5) - 4*arctan(1 / 239) to calculate the value of pi to 53 significant digits.

## Homework Equations

The power series of arctangent(x) is = x − x^3/3 + x^5/5 − x^7/7 + x^9/9......

## The Attempt at a Solution

http://tinypic.com/r/fy1tax/5

I attempted this question on MAPLE 13(shown above), but I get an obvious incorrect answer 3.17.... instead of 3.14.........

Am i using the formula correctly? I've double checked the values and don't think I missed an exponent or inserted the wrong sign.

-Thanks in advance.