Cos 47П/6 Ctg 25П/4 Sin23П/4 Sin23П/4 +cos15П/4

Question

Cos 47П/6
Ctg 25П/4
Sin23П/4
Sin23П/4 +cos15П/4

Answer 1

Cos 47П/6 = cos 11П.6 = 1/2*√3
ctg 25П.4 =ctg П/4 =1
sin 23П/4 =sin 7П/4=-1/2*√2
sin 23П/4+ cos 15П/4= sin 7П/4+cos 7П/4=-1/2*√2+1/2*√2=0