Aufgabe 1
a)
f'x(x,y) = cos(x)*cos(y)^n
f''x(x,y) = -sin(x)*cos(y)^n
f'y(x,y) = sin(x)*n*cos(y)^(n-1) *(-sin(y))
f''y(x,y) = sin(x)*[(n^2-1)*cos(y)^(n-1)*sin(y)^2]
b)
f'x(x,y,z) = (1/x)*arctan(xy) + ln(xz)*[a-(1/sin(xy)^2)]*y
f''x(x,y,z) = (-1/x^2)*arctan(xy) + (1/x)(-1/sin(xy)^2)*y + (1/x)*(-1/sin(xy)^2)*y) + ln(xz)*2*(cos(xy)/sin(xy)^3)*y^2
f'y(x,y,z) = -ln(xz)*(1/sin(xy)^2)*x
f''y(x,y,z) = ln(xz)*2*[cos(xy)/sin(xy)^3]x^2
f'z(x,y,z) = (1/x)*arctan(xy)
f''z(x,y,z) = (-1/x^2)*arctan(xy)
Aufgabe 2
a)
für (2/3)
f = cos(y)^2*[2cos(x+y) - 9 sin(x+y)]
für (1/1)
f = cos(y)^2*[cos(x+y) - 3 sin (x+y)]
b)
für (2/3)
f = (2/x)*arcos(y)-3*ln(x)-cos(y)^(-2)
für (1/1)
f = (1/x)+ arcos(y) - ln(x)*cos^(-2)
Aufgabe 3
Aufgabe 4
a) grada(f) =
x-Richtung:
[-x+b] / [(x-a)^2 + (y-b)^2]^3/2
y-Richtung:
[-y+b] / [(x-a)^2 + (y-b)^2]^3/2