Cos(90-15)cos15= sin15cos15= ¹/₂ * 2sin15cos15= ¹/₂ sin(2*15)=
=¹/₂ sin30=¹/₂ * ¹/₂= 1/4
log(6) 2 * log(6) 18 + log^2(6) 3 = log(6) 2 * log(6) 6*3 + log^2(6) 3 = log(6) 2 * log(6) 3 + log(6) 2 + log^2(6) 3 = log(6) 3*(log(6) 2 + log(6) 3) + log(6) 2 = log(6) 3 *log(6) 2*3 + log(6) 2 = log(6) 2 + log(6) 3 = log(6) 2*3 = log(6) 6 = 1
log(a) b+ log(a)c = log(a) bc
Kx=3
x=0,4
k*0,4=3
k=3:0,4
<u>k=7,5</u>
kx=-1
7,5x=-1
x=-1:7,5
x=-10/75
<u>x= -2/15</u>