Решение в приложении.......................................
Sin(-240°) = -sin240° = - sin(180 + 60) = sin60° = √3/2
cos(-240°) = cos240° = cos(180 + 60) = -cos60° = 1/2
tan(-240°) = -tan240° = -tan(180+60) = -tan60° = -√3
cot(-240°) = -cot240° = -cot(180+60) = -cot60° = -1/√3
X² +(18 -x)² =2(x² -18x+162) =2((x-9)² +81);
min (x² +(18 -x)²= min2((x-9)² +81)=2*81=162 при x =9 .
9 и 9 .