Posted by **alex** on Sunday, May 23, 2010 at 2:37pm.

Now we prove Machin's formula using the tangent addition formula:

tan(A+B)= tanA+tanB/1-tanAtanB.

If A= arctan(120/119) and B= -arctan(1/239), how do you show that

arctan(120/119)-arctan(1/239)=arctan1?

## Answer This Question

## Related Questions

- calculus - Let f be a function defined by f(x)= arctan x/2 + arctan x. the value...
- precal - The values of x that are solutions to the equation cos^(2)x=sin2x in ...
- calc - also: integral of tan^(-1)y dy how is integration of parts used in that? ...
- Calculus - Note that pi lim arctan(x ) = ---- x -> +oo 2 Now evaluate / pi \ ...
- Math - Arrange these in order from least to greatest: arctan(-sqrt3), arctan 0, ...
- check my arctan please - arctan(1/12)= 4.763 rounded to the nearest tenth degree...
- Algebra 2 - In triangle ABC , <C is a right angle. Find the remaining sides ...
- calculus - h(x)= integral from (1, 1/x) arctan(2t)dt part 1: let U= 1/x and du...
- calculus - h(x)= integral from (1, 1/x) arctan(2t)dt part 1: let U= 1/x and du...
- PRE-CALC - sin(arctan(-4/3) okay so i made arctan(-4/3) = x so im solving for ...

More Related Questions