А) y`=(2x^3)`+(-(x^2)/2)`+4` = 6x^2 (x^2)`*2-(x^2)*2` 4x-x^2
+ ( - ------------------------) = - ------------ +
4 4
6x^2 = -x-x^2+6x^2 = 5x^2-x
б) y`=(2cosx)`+(-3tgx)` = -2sinx 1
+ (-3) -----------
cos^2 x
(x-3)`(x+2)-(x-3)(x+2)` x+2-x+3 5
в) y`= ((x-3)/(x+2))`= ------------------------------ = ------------------ = ---------------
(x+2)^2 x^2+4x+4 x^2+4x+4