How do you evaluate $arctan (\frac{1}{3}) + arctan (\frac{1}{2})$ $arctan (1/3) + arctan (1/2)$ ?

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Answer 1 · 2015-06-05T15:28:26

$tan x = \frac{1}{3} \to x = 18.43$ $tan x = 1/3 -> x = 18.43$ deg

$tan y = \frac{1}{2} \to y = 26.57$ $tan y = 1/2 -> y = 26.57$

$(x + y) = 45 d e g = \frac{π}{4}$ $(x + y) = 45 deg = pi/4$

How do you evaluate arctan(13)+arctan(12)arctan (1/3) + arctan (1/2)?