Question

Найдите значение выражений

 

сos^{2}30° x sin^{2}30°  - cos^{2}60° - sin^{2}60°  + cos^{2}45° + sin^{2}45°;

 

sin30° + cos60°;

Answer 1

1) =1/3+1/4-1/4-1/3+1/2+1/2=1

2) 1/2+1/2=1