If cos alpha= 5/13 and cos beta= 35/37, find tan (alpha+beta)?

Question

please help!

Answer 1

From pythogeron therom  5 , 12 ,13 are sides of  right angle triangle .

Here 13 is hypotenuse , 5 is adjacent  side , 12 is opposite side.

From pythogeron therom  37, 12 , 35  are sides of  right angle triangle .

Here 37 is hypotenuse , 35 is adjacent  side , 12 is opposite side.