Đạo hàm và phương trình y'=0

1/> y:= 2*sin(x)+cos(2*x);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
2/> y:= (1/3*(sin(x)^3)-(cos(x))^2);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 3/ > y:= (1/3*(cos(x)^3)+(sin(x))^2);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
4/ > y:= (1/3*(cos(x)^4)+(sin(x))^4);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 5/> y:= (1/3*(cos(x)^4)-(sin(x))^4);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 6/ > y:= (cos(x)^4)-(sin(x))^4;
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 7/ > y:= (cos(x)^6)+(sin(x))^6;
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 8/ > y:= 3*sin(x)+sin(3*x);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 9/ > y:= 3*sin(x)-sin(3*x);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 10/ > y:= sin(2*x)/(2+cos(2*x));
 > y1:=diff(y,x);
> y2:=simplify(y1);
> y3:=solve(y2=0,{x});
 11/ > y:= cos(2*x)/(2+sin(2*x));
> y1:=diff(y,x);
> y2:=simplify(y1);
> y3:=solve(y2=0,{x});
 12/ > y:=sqrt( cos(1*x))+sqrt(sin(x));
> y1:=diff(y,x);
> y2:=simplify(y1);
> y3:=solve(y2=0,{x});
 13/ > y:=(sin(x))^2 + 3*cos(2*x);
> y1:=diff(y,x);
> y2:=simplify(y1);
> y3:=solve(y2=0,{x});
 14/ > y:=e^(x)*sin(x);
> y1:=diff(y,x);
> y2:=simplify(y1);
> y3:=solve(y2=0,{x});
 15/ > y:=e^(x)*cos(x);
> y1:=diff(y,x);
> y2:=simplify(y1);
> y3:=solve(y2=0,{x});
 16/ > y:=e^(x)*(x-1);
> y1:=diff(y,x);
> y2:=simplify(y1);
> y3:=solve(y2=0,{x});
17/ > y:=(x)*e^(1-x);
> y1:=diff(y,x);
> y2:=simplify(y1);
> y3:=solve(y2=0,{x});
18/ > y:=(x)*e^(x-1);
> y1:=diff(y,x);
> y2:=simplify(y1);
> y3:=solve(y2=0,{x});
19/ > y:=(x)^2*e^(x^2);
> y1:=diff(y,x);
> y2:=simplify(y1);
> y3:=solve(y2=0,{x});
20/ > y:=(x)^2*e^(x^2-1);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 21/ > y:=(x)^2*e^(x);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 22/ > y:=(x)^2*e^(x-1);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 23/ > y:=(x)*e^(sqrt(x));
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
24/ > y:=(sqrt(4+x))+(sqrt(4-x));
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 25 / > y:=(sqrt(4+x^2))-(sqrt(x^2));
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 x = 0
 26/ > y:=(sqrt(4-x^2))+(sqrt(x^2));
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 x = 0
 27/ > restart:
> y:= x+(sqrt(2-x^2));
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 28/ > y:= 3*x-5*(sqrt(4+x^2));
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
29/> y:= 6*x-8*(sqrt(4*x-x^2));
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
30/ > y:= 3*sqrt(4-x)+6*sqrt(x+6);
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 31/ > y:= 3*sqrt(9-x)+6*sqrt(x+6);
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 32/ > y:= 3*sqrt(12-x)+6*sqrt(x+8);
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 33/ > y:= x*ln(x);
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 34/ > y:= ln(x)/x;
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 35/ > y:= ln(x)/x^2;
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 36/ > y:= ln(x)*x^2;
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 37/ > y:=( x^2)*ln(x^2);
> y1:=diff(y,x);
> y2:=solve(y1 =0,{x});
 38/ > y:=1*x-ln(x^2-1*x+1);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 39/ > y:=1*x-2*ln(5*x^2+5*x+10);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
40/ > y:=1*x+2*ln(5*x^2+5*x+10);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 41/ > y:=1*x-1*ln(5*x^2-10*x+10);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 42/ > y:=1*x-1*ln(1*x^2-10*x+10);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 43/ > y:=1*x*e^(-x^2/2);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});
 44/ > y:=tan(x)+cot(x);
> y1:=diff(y,x);
> y2:=solve(y1=0,{x});