Verified answer

Объяснение:

1)

cos60+sin30=1/2+1/2=1

2)

7tg²45°-3sin45°=

=7•1²-3•√2/2=7-(3√2/2)

3) sin (π/4) cos (π/4) tg (π/3)=

=(√2/2)•(√2/2)•√3=√3/2

4)

cos(3π/2)-sin(3π/2)=0-(-1)=0+1=1