If, where
, find the values of
(i) sin (x + y)
(ii) cos (x + y)
(iii) tan (x – y)
,
Here we will find values of cosx and cosy
(i) sin(x + y) = sinx.cosy + cosx.siny
(ii)cos(x + y) = cosx.cosy + sinx.siny
(iii)Here first we will calculate value of tanx and tany,