Răspuns :
sin30°=1/2
cos30°=√3/2
sin45°=√2/2=1/√2
cos45°=√2/2=1/√2
1/2+√3/2-1/√2+1/√2=1/2+√3/2=(1+√3)/2
cos30°=√3/2
sin45°=√2/2=1/√2
cos45°=√2/2=1/√2
1/2+√3/2-1/√2+1/√2=1/2+√3/2=(1+√3)/2