👤

calculati:a)sin30*cos60*+sin60*co30* b)cos60*cos30*-sin60*sin30* c)cos60*-cos la a 2 30*+sin la a2 30* d)sin60*-2sin30*cos30*

Răspuns :

b) 1supra2*√3supra3-√3supra3*1supra2=12-12=0 a) 1/2*1/2+√3/2*√3/2=4+36=40 c) √3/2-2*1/2*√3/2