Question 911647
sin x = 15/17 , cos x = 8/17, tan x = 15/8
tan y = 12/5, sin y = 12/13, cos y = 5/13
Plug and Play
a)sin(x + y) = sin x cosy  +  cos x sin y
b. tan(x ± y) =  (tan x + tan y)/(1- tan x tan y)