Question 870624
(sin A cos B +cos A sin B) the whole square + (cos A cos B- sin A sin B) the whole square.

A=60
sin A ={{{sqrt(3)/2}}}
cos A = {{{1/2}}}
B=30
Cos B = {{{sqrt(3)/2}}}
Sin B = 1/2

{{{((sqrt(3)/2)*(sqrt(3)/2)+(1/2)(1/2))^2 + ((sqrt(3)/2)*(1/2)+(sqrt(3)/2)*(1/2))^2}}}

{{{((3/4)+(1/4))^2}}}+{{{((sqrt(3)/4)+(sqrt(3)/4))^2}}}


{{{(1)^2+((2sqrt(3))/4)^2}}}


{{{7/4}}}