=sin60*cos30+sin30*cos60

=√3/2*√3/2+ 1/2* 1/2

=3/4+ 1/4

1

(2) The original formula = Tan (720-45)+ Tan (720+45)- Tan (30-360)+ Tan (30-720)

=tan(-45)+tan45-tan30+tan30

=tan45+tan45

=2

(3) The original formula = sin (4π+π/6)+COS (8π+π/3)+Tan (-6π-π/4).

=sinπ/6+cosπ/3+tan(-π/4)

= 1/2+ 1/2+ 1

=2