1)0.52*10^8 3)17,75×10^-2 4)21,25*10^3
1)1)sin330°= sin(270°+60°) = -cos60° = -1/2
2)cos240° = cos(180°+60°) = -cos60° = -1/2
(1+3А)+(А^2-2А)=1+3А+А^2-2А=А^2+А+1
1) x² >= 0
_____________
+ 0 +
x э ( - бесконечности; + бесконечности)
2) x² <= 0
_______________
+ 0 +
x = 0