1)arccos1+arcsin0 = 0,5π + 0 = 0,5π
9+(30х-100)=2
9+30х-100=2
30х=2-9+100
30х=93
х=93:30
х=3,1
cosa+cosa/sina-sina=cosa/sina+cosa/sina- sina/cosat= 2cosa-sina
1
1)(b+2)/(b-1)²*3(b-1)/[(b-2)(b+2)]=3/[(b-1)(b-2)]
2)3/[(b-1)(b-2)]-3/(b-2)=(3-3b+3)/[(b-1)(b-2)]=-3(b-2)/[(b-1)(b-2)]=3/(1-b)
2
1)1/(a-2)²+2/[(a-2)(a+2)+1/(a+2)²=(a²+4a+4+2a²-8+a²-4a+4)/(a²-4)²=
=4a²/(a²-4)²
2)4a²/(a²-4)*(a²-4)²/2a=2a